.gitattributes

+*.v gitlab-language=coq
+
+# Convert to native line endings on checkout.
+*.ref text
+# Shell scripts need Linux line endings.
+*.sh eol=lf

.gitignore

 *.vo
+*.vos
+*.vok
 *.vio
 *.v.d
+.coqdeps.d
 *.glob
 *.cache
 *.aux
@@ -8,6 +11,17 @@
 .\#*
 *~
 *.bak
+.coqdeps.d
 .coq-native/
-Makefile.coq
 *.crashcoqide
+.env
+builddep/
+_CoqProject.*
+Makefile.coq
+Makefile.coq.conf
+.Makefile.coq.d
+Makefile.package.*
+.Makefile.package.*
+_opam
+_build
+*.install

.gitlab-ci.yml

-image: ralfjung/opam-ci:latest
+image: ralfjung/opam-ci:opam2
+
+stages:
+  - build
 
 variables:
-  CPU_CORES: "9"
+  CPU_CORES: "10"
+  OCAML: "ocaml-variants.4.14.0+options ocaml-option-flambda"
+  # Avoid needlessly increasing our TCB with native_compute
+  COQEXTRAFLAGS: "-native-compiler no"
+
+.only_branches: &only_branches
+  only:
+  - /^master/@iris/iris
+  - /^ci/@iris/iris
+
+.only_mr: &only_mr
+  only:
+  - merge_requests
 
-iris-coq8.6:
+.branches_and_mr: &branches_and_mr
+  only:
+  - /^master/@iris/iris
+  - /^ci/@iris/iris
+  - merge_requests
+
+.template: &template
+  <<: *only_branches
+  stage: build
+  interruptible: true
   tags:
-  - fp-timing
+  - fp
   script:
-  # prepare
-  - . build/opam-ci.sh coq 8.6 coq-mathcomp-ssreflect 1.6.1
-  - env | egrep '^(CI_BUILD_REF|CI_RUNNER)' > build-env.txt
-  # build
-  - 'time make -j$CPU_CORES TIMED=y 2>&1 | tee build-log.txt'
-  - 'if fgrep Axiom build-log.txt >/dev/null; then exit 1; fi'
-  - 'cat build-log.txt | egrep "[a-zA-Z0-9_/-]+ \(user: [0-9]" | tee build-time.txt'
-  - 'if (( RANDOM % 10 == 0 )); then make validate; fi'
+  - git clone https://gitlab.mpi-sws.org/iris/ci.git ci -b opam2
+  - ci/buildjob
   cache:
-    key: "coq8.6"
+    key: "$CI_JOB_NAME"
     paths:
-    - opamroot/
+    - _opam/
+  except:
+  - triggers
+  - schedules
+  - api
+
+## Build jobs
+
+# The newest version runs with timing.
+build-coq.8.20.1:
+  <<: *template
+  variables:
+    OPAM_PINS: "coq version 8.20.1"
+    DENY_WARNINGS: "1"
+    MANGLE_NAMES: "1"
+    OPAM_PKG: "1"
+    DOC_DIR: "coqdoc@center.mpi-sws.org:iris"
+    DOC_OPTS: "--external https://plv.mpi-sws.org/coqdoc/stdpp/ stdpp"
+  tags:
+  - fp-timing
+  interruptible: false
+
+# The newest version also runs in MRs, without timing.
+build-coq.8.20.1-mr:
+  <<: *template
+  <<: *only_mr
+  variables:
+    OPAM_PINS: "coq version 8.20.1"
+    DENY_WARNINGS: "1"
+    MANGLE_NAMES: "1"
+
+# Also ensure Dune works.
+build-coq.8.20.1-dune:
+  <<: *template
+  <<: *branches_and_mr
+  variables:
+    OPAM_PINS: "coq version 8.20.1   dune version 3.15.2"
+    MAKE_TARGET: "dune"
+
+# The oldest version runs in MRs, without name mangling.
+build-coq.8.19.2:
+  <<: *template
+  <<: *branches_and_mr
+  variables:
+    OPAM_PINS: "coq version 8.19.2"
+
+trigger-stdpp.dev:
+  <<: *template
+  variables:
+    STDPP_REPO: "iris/stdpp"
+    OPAM_PINS: "coq version $NIGHTLY_COQ   git+https://gitlab.mpi-sws.org/$STDPP_REPO#$STDPP_REV"
+    CI_COQCHK: "1"
+  except:
   only:
-  - master
-  - ci
-  - timing
-  artifacts:
-    paths:
-    - build-time.txt
-    - build-env.txt
+  - triggers
+  - schedules
+  - api

.gitlab/issue_templates/Bug.md

+<!--
+
+When reporting a bug, please always include the version of Iris you are using.
+If you are using opam, you can determine your Iris version by running
+
+  opam show coq-iris -f version
+
+-->

CHANGELOG.md

 In this changelog, we document "large-ish" changes to Iris that affect even the
-way the logic is used on paper.  We also mention some significant changes in the
-Coq development, but not every API-breaking change is listed.  Changes marked
-`[#]` still need to be ported to the Iris Documentation LaTeX file(s).
+way the logic is used on paper.  We also document changes in the Coq
+development; every API-breaking change should be listed, but not every new
+lemma.
+
+## Iris master
+
+**Changes in `algebra`:**
+
+* Add lemma `ufrac_auth_update_surplus_cancel`.
+* Rename `CsumBot`, `GSetBot`, `CoPsetBot` and `ExclBot` to `*Invalid`.
+* Add `agree_includedN`, `excl_included` and `excl_includedN`.
+
+**Changes in `base_logic`:**
+
+* Add lemmas `own_forall` and `own_and` to reason about universal quantification
+  (`∀ .. own`) and conjunctions (`own .. ∧ own ..`) of ghost ownership. (by
+  Travis Hance)
+  + These rules are derived from the new primitive rule `ownM_forall` (which is
+    proved in the `uPred` model).
+  + Various corollaries for total cmras (which include `ucmra`s) are provided.
+* Add lemma `Some_included_totalI`.
+* Simplify lemma `excl_includedI` to use `=` instead of `match`.
+
+**Changes in `bi`:**
+
+* Merge the two `BiFUpdPlainly` laws `fupd_plainly_mask_empty` and
+  `fupd_plainly_keep_l` into a single law, by generalizing `fupd_plainly_keep_l`
+  so that it subsumes both of them.
+* Change `WP` notation to allow type annotations and (exhaustive) patterns for
+  the return value binder.
+* Rename `bi.lib.fixpoint` module to `bi.lib.fixpoint_mono`.
+* Add `bi.lib.fixpoint_banach` module with lemmas for proving that a `fixpoint`
+  (of a contractive function) is persistent/affine/etc. (with help from William
+  Mansky)
+* Remove the `bool`-valued `stuckness_leb`; use `stuckness_le` (in `Prop`)
+  instead.
+
+**Changes in `proofmode`:**
+
+* Generalize `AsEmpValid` to allow specifying which directions of the bi-implication
+  hold. This allows embedded logics to enable support for `iPoseProof` and `iStartProof`
+  independently. (by Michael Sammler)
+
+**Changes in `heap_lang`:**
+
+* Add `Inhabited lock_name` to `lock` class. (by Daniel Nezamabadi)
+
+**Infrastructure:**
+
+* Use `gmake` (GNU Make) instead of `make` on BSD systems. (by Yiyun Liu)
+
+The following `sed` script helps adjust your code to the renaming (on macOS,
+replace `sed` by `gsed`, installed via e.g. `brew install gnu-sed`).
+Note that the script is not idempotent, do not run it twice.
+```
+sed -i -E -f- $(find theories -name "*.v") <<EOF
+# "*Bot* RA element rename
+s/\b(Csum|GSet|CoPset|Excl)Bot(\b|_)/\\1Invalid\\2/g
+# bi.lib.fixpoint rename: adjust imports
+s/(From iris.* Require .*|Require iris.*)\bfixpoint\b/\\1fixpoint_mono/g
+EOF
+```
+
+## Iris 4.3.0 (2024-10-30)
+
+This Iris release mostly features quality-of-life improvements, such as
+improvements to `iInduction`, a new `iUnfold` tactic, and improved errors
+in `iInv`. Furthermore, like std++, Iris can now be built with dune.
+
+Iris 4.3.0 supports Coq 8.19 and 8.20. Coq 8.18 is no longer supported.
+
+This release was managed by Jesper Bengtson, Ralf Jung and Robbert Krebbers, 
+with contributions from Benjamin Peters, Isaac van Bakel, Jan-Oliver Kaiser,
+Janggun Lee, Michael Sammler, Ralf Jung, Robbert Krebbers, Rodolphe Lepigre
+Sanjit Bhat, Tej Chajed, William Mansky, and Yusuke Matsushita.
+Thanks a lot to everyone involved!
+
+
+**Changes in `algebra`:**
+
+* Add lemmas `big_opS_gset_to_gmap` and `big_opS_gset_to_gmap_L`, which rewrite
+  between `gset_to_gmap` and big set ops of singleton maps.  (by Isaac van
+  Bakel)
+* Add lemmas `discrete_fun_update` and `discrete_fun_updateP`, which updates an
+  abitrary `discrete_fun` to another. For `discrete_fun_updateP`, this requires
+  the domain to be finite, similar to `discrete_fun_included_spec`. (by Janggun Lee)
+* Add lemmas `discrete_fun_singleton_valid` and `discrete_fun_singleton_unit`, which simplify 
+  cmra validity and unit used with `discrete_fun_singleton`. (by Janggun Lee)
+* Add `Inhabited` instance for the solution of the COFE solver.
+
+**Changes in `bi`:**
+
+* Add instances for `match _ with _ end` (and thus `if _ then _ else` and
+  `'(_, _)` pair destructuring) for `Persistent`, `Affine`, `Absorbing`,
+  `Timeless`, and `Plain`. (by Sanjit Bhat)
+
+**Changes in `proofmode`:**
+
+* Remove the `*` specialization pattern. This pattern has been deprecated and a
+  no-op since 2017. See https://gitlab.mpi-sws.org/iris/iris/-/merge_requests/41.
+* Improve the error message of `iInv` in case the goal does not support
+  invariant opening.
+* Change `iInduction` to always generate a magic wand instead of sometimes
+  generating an implication for reverted hypotheses.
+* Add `iUnfold` tactic.
+* Improve ability to name induction hypotheses (IHs) in `iInduction`: when
+  performing `iInduction x as cpat` the names of the IHs in the Coq introduction
+  pattern `cpat` are used to name the IHs in the proof mode context. For
+  example, `iInduction n as [|n IH]` and `iInduction t as [|l IHl r IHr]`.
+
+**Changes in `base_logic`:**
+
+* Add lemma `na_own_empty` and persistence instance for `na_own p ∅` for
+  non-atomic invariant tokens. (by Benjamin Peters)
+* Add instances `big_sepL_flip_mono'`, `big_sepM_flip_mono'`, etc., which are
+  wrappers of instances `big_sep*_mono'` for `flip (⊢)` instead of `(⊢)`. (by
+  Yusuke Matsushita)
+
+**Changes in `program_logic`:**
+
+* Add missing proofmode instances for error reporting and opening invariants
+  around total weakest preconditions. (by Janggun Lee)
+
+**Changes in `heap_lang`:**
+
+* Make `wp_cmpxchg_fail` work when the points-to is in the persistent context.
+* Seal definition of `pointsto`, add copies of all relevant lemmas.
+
+**Infrastructure:**
+
+* Add support for compiling the packages with dune. (by Rodolphe Lepigre) 
+
+
+## Iris 4.2.0 (2024-04-12)
+
+The highlights of this release are:
+* We have new laws to "undiscard" discarded fractions, allowing one to update
+  from `DfracDiscarded` to `DfracOwn(q)` for some fresh `q`. This gives rise to
+  new laws for all constructions that use `dfrac`, such as
+  `ghost_map_elem_unpersist : ∀ k γ v, k ↪[γ]□ v ==∗ ∃ q, k ↪[γ]{#q} v`.
+* The `gmap_view K V` camera now supports value types `V` that are arbitrary
+  cameras, and lifts their composition to the whole map. The previous `gmap_view`
+  type can be recovered as `gmap_view K (agree V)`.
+* The `iFrame` tactic has become stronger for goals that contain existential
+  quantifiers: `iFrame` will now attempt to instantiate these. For example,
+  framing `P x` in goal `Q ∗ ∃ y, P y ∗ R` will now succeed with remaining
+  goal `Q ∗ R`.
+
+Iris 4.2 supports Coq 8.18 and 8.19.
+Coq 8.16 and 8.17 are no longer supported.
+
+This release was managed by Ralf Jung and Robbert Krebbers, with contributions
+from Ike Mulder, Jan-Oliver Kaiser, Johannes Hostert, Pierre Roux, Thomas
+Somers, and Yixuan Chen. Thanks a lot to everyone involved!
+
+**Changes in `algebra`:**
+
+* Rename `discrete` to `discrete_0`, to make room for a new lemma `discrete`
+  that works for all `n` : `x ≡{n}≡ y → x ≡ y`.
+* Enable `f_equiv` and `solve_proper` to exploit the fact that `≡{n}≡` is a
+  subrelation of `≡` and `=`.
+* Rename `iso_cmra_mixin_restrict` to `iso_cmra_mixin_restrict_validity`, and
+  simplify its statement and that of `iso_cmra_mixin` by removing the `g_equiv`
+  assumption that follows from the other assumptions.
+* Add `inj_cmra_mixin_restrict_validity` as a more general version of
+  `iso_cmra_mixin_restrict_validity`.
+* Change statement of `Z_local_update` to be more intuitive. It now says
+  `x - y = x' - y' → (x,y) ~l~> (x',y')`, i.e., the difference between the
+  authoritative element and the fragment must stay the same.
+* Rename `cmra_discrete_update` → `cmra_discrete_total_update` and
+  `cmra_discrete_updateP` → `cmra_discrete_total_updateP`. Repurpose original
+  names for lemmas that only require `CmraDiscrete`, not `CmraTotal`.
+* Add a law for undiscarding discarded fractions, allowing one to update from
+  `DfracDiscarded` to `DfracOwn(q)` for some fresh `q`. This formalizes the
+  intuition that a discarded fraction is merely an "existentially quantified
+  fraction." (by Johannes Hostert)
+* Add laws for un-persisting resources with a discardable fractional part,
+  based on the undiscarding law for discardable fractions. For example,
+  `gmap_view_frag k DfracDiscarded v ~~>: λ a, ∃ q, a = gmap_view_frag k (DfracOwn q) v`
+  will allow recovering a fractional points-to from a discarded one. (by Johannes
+  Hostert)
+* Generalize `gmap_viewUR K A` from `A : ofe` to `A : cmra`. Previously, the
+  "agreement" camera was part of the definition, now the user can pick an
+  arbitrary camera. All lemmas that exposed agreement properties have
+  been generalized to expose general camera validity/composition.
+  For porting:
+  + Replace `gmap_viewR K V` by `gmap_viewR K (agreeR V)`.
+  + Definitions and proofs on top of this will need to be manually adjusted.
+  + Replace `gmap_view_update` by `gmap_view_replace`.
+  + Proofs using `gmap_view_both_dfrac_valid_L` should instead use
+    `gmap_view_both_dfrac_valid_discrete_total` followed by `to_agree_included_L`.
+
+**Changes in `proofmode`:**
+
+* The `iFrame` tactic has become slightly weaker for goals that contain both
+  evars and either `∨` or `∧`. This prevents an exponential slowdown of
+  `iFrame` on some goals. This change should be backwards compatible for almost
+  all proofs. If you define or use custom `Frame` instances, note that the 
+  `MaybeFrame` class has become notation for `TCNoBackTrack (MaybeFrame' ...)`,
+  which means the proofs of your instances might need a slight refactoring.
+* Adjust the `iFrame` proof search to use `QuickAffine` and `QuickAbsorbing`
+  instead of `Affine` and `Absorbing`. This fixes some performance issues with
+  large terms in non-affine logics, at the expense of a slight reduction in what
+  `iFrame` can do in these logics.
+* The `iFrame` tactic has become stronger for goals that contain existential
+  quantifiers: `iFrame` will now attempt to instantiate these. For example,
+  framing `P x` in goal `Q ∗ ∃ y, P y ∗ R` will now succeed with remaining
+  goal `Q ∗ R`. `iFrame` still behaves the same when no instantiation can be
+  found: framing `R` in goal `Q ∗ ∃ y, P y ∗ R` still gives `Q ∗ ∃ y, P y`.
+  This should simplify and potentially even speed up some proofs (MR: iris/iris!1017).  
+  Porting to this change will require manually fixing broken proofs: `iFrame`
+  may now make more progress than your proof script expects. Proofs that look
+  like `iFrame. iExists _. iFrame.` may need to be replaced with just `iFrame.`
+  In some cases, you may need to be explicit in what hypotheses to `iFrame`,
+  to prevent wrong instantiation of existential quantifiers.  
+  To temporarily fix broken proofs, you can restore `iFrame`'s old behavior with:
+  ```
+  Local Instance frame_exist_instantiate_disabled :
+    FrameInstantiateExistDisabled := {}.
+  ```
+  `iFrame` will not instantiate existential quantifiers below connectives such as
+  `-∗`, `∀`, `→` and `WP`, since this is more frequently unsafe (MR: iris/iris!1035).
+  If you have custom recursive `Frame` instances for which you want to disable 
+  instantiating existential quantifiers, you need to replace the `Frame ...` premise
+  of your instance with `(FrameInstantiateExistDisabled → Frame ...)`.
+* `iFrame` no longer loops on `[∗mset ] x ∈ X, ..` when `X` is an existential variable 
+   (MR: iris/iris!1039). (by Jan-Oliver Kaiser for BedRock Systems)
+
+**Changes in `base_logic`:**
+
+* Rename `mapsto` to `pointsto` to align with standard separation logic
+  terminology.
+* Add laws for un-persisting assertions with a discardable fractional permission,
+  for example `l ↦□ v ==∗ ∃ q, l ↦{#q} v`, using the new laws from `algebra`
+  (see above). These laws allow one to update a persistent (discarded) assertion,
+  like a points-to, back into a fractionally owned one, where the fraction is
+  existentially quantified. They are useful when e.g. constructing invariants
+  that allow exchanging fractional assertions. See !960 for more details. (by
+  Johannes Hostert)
+* Add `token` library, providing a simple ghost token as a logic-level wrapper
+  over the RA `excl unit`.
+* Add lemma `lc_fupd_add_laterN`. (by Thomas Somers)
+
+**Changes in `program_logic`:**
+
+* Rename `head_step` to `base_step` to avoid potential confusion with the
+  standard term "head reduction", and also rename all associated definitions and
+  lemmas. In particular: `head_stuck` → `base_stuck`, `head_reducible` →
+  `base_reducible`, `head_irreducible` → `base_irreducible`, `head_redex` →
+  `base_redex`, `head_atomc` → `base_atomic`. The sed script will rename all
+  definitions and lemmas that come with Iris, but if you had additional
+  definitions or lemmas with `head` in their name, you will have to rename them
+  by hand if you want to remain consistent.
+
+**Changes in `heap_lang`:**
+
+* Replace `wp_lb_init` with a more general `steps_lb_0` lemma for creating a
+  `steps_lb` without depending on WP. (by Thomas Somers)
+* Add generic lemma `twp_wp_step_lc` to derive WP with later credits from TWP.
+* Add Texan triples with later credits for stateful operations: `wp_alloc_lc`,
+  `wp_alloc_lc`, `wp_free_lc`, `wp_load_lc`, `wp_store_lc`, `wp_xchg_lc`,
+  `wp_cmpxchg_fail_lc`, `wp_cmpxchg_suc_lc`, and `wp_faa_lc`.
+
+The following `sed` script helps adjust your code to the renaming (on macOS,
+replace `sed` by `gsed`, installed via e.g. `brew install gnu-sed`).
+Note that the script is not idempotent, do not run it twice.
+```
+sed -i -E -f- $(find theories -name "*.v") <<EOF
+# discrete camera updates
+s/\bcmra_discrete_update\b/cmra_discrete_total_update/g
+s/\bcmra_discrete_updateP\b/cmra_discrete_total_updateP/g
+# maps-to → points-to
+s/(\b|_)mapsto(\b|_)/\1pointsto\2/g
+# Head reduction
+s/(\b|_)head_(step|stuck|ctx|prim_|(ir)?reducible)/\1\base_\2/g
+EOF
+```
+
+## Iris 4.1.0 (2023-10-11)
+
+This Iris release mostly features quality-of-life improvements, such as smarter
+handling of `->`/`<-` patterns by `iDestruct`, support for an arbitrary number of
+Coq intro patterns in the Iris proofmode tactics (`iIntros`, `iDestruct`, etc.),
+and support for immediately introducing the postcondition of a WP specification
+via `wp_apply lemma as "Hpost"`.
+
+The biggest changes and new features are:
+* Logically atomic triples now support private (non-atomic) postconditions, and
+  the notation was changed to not clash with Autosubst any more. Existing users
+  of logically atomic specifications have to update their notation, see the full
+  CHANGELOG for more details.
+* The meaning of `P -∗ Q` as a Coq proposition has changed from `P ⊢ Q` to
+  `⊢ P -∗ Q`. If you are only using the Iris proofmode, this will not make a
+  difference, but when writing proof scripts or tactics that `rewrite` or
+  `apply` Iris lemmas, the exact position of the `⊢ P -∗ Q` matters and this
+  will now always be visible in lemma statements.
+* `iCombine` is starting to gain support for a `gives` clause, which yields
+  persistent facts gained from combining the resources. So far, this remains
+  mostly experimental. We support `↦` and the connectives of ghost theories in
+  `base_logic/lib`, but support for `own` and custom cameras is minimal and will
+  be improved in future releases.
+* Some initial refactoring prepares Iris for eventually supporting transfinite step-indexing.
+* New resources algebras have been added: `Z`, `max_Z`, `mono_Z`, and `mra` (the
+  monotone resource algebra of https://iris-project.org/pdfs/2021-CPP-monotone-final.pdf)
+
+Iris 4.1 supports Coq 8.16-8.18. Coq 8.13-8.15 are no longer supported.
+
+This release was managed by Ralf Jung, Robbert Krebbers, and Johannes Hostert,
+with contributions from Amin Timany, Arthur Azevedo de Amorim, Armaël Guéneau,
+Benjamin Peters, Dan Frumin, Dorian Lesbre, Ike Mulder, Isaac van Bakel, Jaemin
+Choi, Janine Lohse, Jan-Oliver Kaiser, Jonas Kastberg Hinrichsen, Lennard Gäher,
+Mathias Adam Møller, Michael Sammler, Paolo Giarrusso, Pierre Roux, Rodolphe
+Lepigre, Simcha van Collem, Simon Friis Vindum, Simon Spies, Tej Chajed, Yixuan
+Chen, and Yusuke Matsushita. Thanks a lot to everyone involved!
+
+
+**Changes in `prelude`:**
+
+* Re-export `stdpp.options` from `iris.prelude.options`. This enables 'light'
+  name mangling, which prefixes auto-generated names with `__`. This only
+  affects developments that explicitly opt-in to following the Iris
+  configuration by importing `iris.prelude.options`.
+
+**Changes in `algebra`:**
+
+* Add (basic) support for `gset` and `gset_disj` cameras to `set_solver`.
+* Rename `sig_{equiv,dist}_alt` into `sig_{equiv,dist}_def` and state these
+  lemmas using `=` instead of `<->`.
+* Add custom entry `dfrac` that can be used for `{dq}` / `□` / `{# q}`
+  annotation of connectives with a discardable fraction.
+* Add an RA on the `Z` type of integers, using addition for `⋅`.
+* Prepare Iris to generalize the type of step-indices. This is a large series of
+  changes; more changes will follow later. More documentation will follow as
+  part of
+  [this merge request](https://gitlab.mpi-sws.org/iris/iris/-/merge_requests/888).
+  - Change the definition of `dist_later` to an equivalent definition that is
+    future-proof with respect to general step-indices.
+  - Change the definition of the properties of an `ofe` to be slightly more
+    general and future proof (i.e., change `dist_S` into `dist_lt`).
+  - Adapt `f_contractive` to work with the new definition of `dist_later`.
+    For backwards compatibility for existing developments, the tactic
+    `f_contractive_fin` is provided. It uses the old definition of `dist_later`,
+    now called `dist_later_fin`.
+  - If you need to deal with a `dist_later`/`dist_later_fin` in a manual proof,
+    use the tactic `dist_later_intro`/`dist_later_fin_intro` to introduce it.
+  (by Michael Sammler, Lennard Gäher, and Simon Spies)
+* Add `max_Z` and `mono_Z` cameras.
+* Add `dfrac_valid`.
+* Rename `Some_included_2` to `Some_included_mono`.
+* Consistently use `Some x ≼ Some y` to express the reflexive closure of
+  `x ≼ y`. This changes the statements of some lemmas: `singleton_included`,
+  `local_update_valid0`, `local_update_valid`. Also add various new
+  `Some_included` lemmas to help deal with these assertions.
+* Add hints for `a ≼ a ⋅ _` / `a ≼ _ ⋅ a` / `ε ≼ _` / `_ ≼ CsumBot` /
+  `_ ≼ ExclBot` with cost 0, which means they are used by `done` to finish
+  proofs. (by Ike Mulder)
+* Rename `singleton_mono` to `singleton_included_mono`.
+* Use `Strategy expand` for CMRA/UCMRA coercions and most projections to improve
+  performance of type-checking some large CMRA/OFE types. (by Ike Mulder)
+* Add monotone resource algebra, `algebra/mra.v`, to enable reasoning about
+  monotonicity with respect to an arbitrary preorder relation: the extension order
+  of `mra R` is designed to embed the preorder relation `R`. (by Amin Timany)
+* Rename instances `union_with_proper` → `union_with_ne`,
+  `map_fmap_proper` → `map_fmap_ne`, `map_zip_with_proper` → `map_zip_with_ne`.
+* Rename `dist_option_Forall2` → `option_dist_Forall2`. Add similar lemma
+  `list_dist_Forall2`.
+* Add instances `option_fmap_dist_inj` and `list_fmap_dist_inj`.
+* Rename `list_dist_cons_inv_r` → `cons_dist_eq` and remove
+  `list_dist_cons_inv_l` to be consistent with `cons_equiv_eq` in std++.
+  (If you needed `list_dist_cons_inv_l`, you can apply `symmetry` and
+  then use `cons_dist_eq`.)
+  Add similar lemmas `nil_dist_eq`, `app_dist_eq`, `list_singleton_dist_eq`,
+  `dist_Permutation`.
+
+**Changes in `bi`:**
+
+* Use `binder` in notations for big ops. This means one can write things such
+  as `[∗ map] '(k,_) ↦ '(_,y) ∈ m, ⌜ k = y ⌝`.
+* Add constructions `bi_tc`/`bi_nsteps` to create the transitive/`n`-step
+  closure of a PROP-level binary relation. (by Simcha van Collem)
+* Make the `unseal` tactic of `monPred` more consistent with `uPred`:
+  + Rename `MonPred.unseal` → `monPred.unseal`
+  + No longer unfold derived BI connectives `<affine>`, `<absorb>` and `◇`.
+  * Make `monPred.unseal` tactic more robust by using types to unfold the right
+    BI projections.
+* Add `unseal` tactic for `siProp`.
+* Add compatibility lemmas for `big_sepL <-> big_sepL2`, `big_sepM <-> big_sepM2`
+  with list/maps of pairs; and `big_sepM <-> big_sepL` via `list_to_map` and
+  `map_to_list`. (by Dorian Lesbre)
+* Make `persistently_True` a bi-entailment; this changes the default `rewrite`
+  direction.
+* Make `BiLaterContractive` a class instead of a notation.
+* Make projections of `Bupd`/`Fupd`/`InternalEq`/`Plainly` operational type
+  classes `Typeclasses Opaque`.
+* Make BI relations (`bi_rtc`, `bi_tc`, `bi_nsteps`) typeclasses opaque (they
+  were accidentally transparent).
+* Make the `P -∗ Q` notation in stdpp_scope (i.e., outside of bi_scope) a
+  shorthand for `⊢ P -∗ Q` rather than `P ⊢ Q`. This means that any BI notation
+  used in stdpp_scope will be sugar for adding a leading `⊢` (`bi_emp_valid`).
+  It also means that `apply` becomes sensitive to the difference between `P ⊢ Q`
+  and `P -∗ Q`, and `rewrite` will only work with lemmas that are explicitly
+  written using `⊢`.
+  When a proof breaks, there are generally 3 options:
+  - Try to find the `-∗` that should be turned into a `⊢` so that things work
+    like before.
+  - Adjust the proof to use proof mode tactics rather than Coq tactics (in
+    particular, replace `apply` by `iApply`).
+  - Add some `apply bi.entails_wand`/`apply bi.wand_entails` to 'convert'
+    between the old and new way of interpreting `P -∗ Q`.
+* Add `auto` hint to introduce the BI version of `↔`.
+* Change `big_sepM2_alt` to use `dom m1 = dom2 m2` instead of
+  `∀ k, is_Some (m1 !! k) ↔ is_Some (m2 !! k)`. The old lemma is still
+  available as `big_sepM2_alt_lookup`.
+* Overhaul `Fractional`/`AsFractional`:
+  - Remove `AsFractional → Fractional` instance.
+  - No longer use `AsFractional P Φ q` backwards, from `Φ` and `q` to `P` -- just
+    use `Φ q` instead.
+  - Remove multiplication instances (that also go from `AsFractional` to
+    `Fractional`, making it very hard to reason about search termination).
+  - Rewrite `frame_fractional` lemma using the new `FrameFractionalQp` typeclass
+    for `Qp` reasoning.
+  - Change statements of `fractional_split`, `fractional_half`, and
+    `fractional_merge` to avoid using `AsFractional` backwards, and only keep
+    the bi-directional versions (remove `fractional_split_1`,
+    `fractional_split_2`, `fractional_half_1`, `fractional_half_2`).
+    `iDestruct`/`iCombine`/`iSplitL`/`iSplitR` should be used instead.
+* Add missing transitivity, symmetry and reflexivity lemmas about the `↔`, `→`,
+  `-∗` and `∗-∗` connectives. (by Ike Mulder)
+* Add `∗-∗` as notation in `stdpp_scope` similar to `-∗`. This means `P ∗-∗ Q`
+  can be directly used as lemma statement, and is syntactic sugar for `⊢ P ∗-∗ Q`.
+* Add `≼` connective (`internal_included`) on the BI level. (by Ike Mulder)
+* Move laws of persistence modality out of `BiMixin` into `BiPersistentlyMixin`.
+* Provide smart constructor `bi_persistently_mixin_discrete` for
+  `BiPersistentlyMixin`: Given a discrete BI that enjoys the existential
+  property, a trivial definition of the persistence modality can be given.
+* Fix `greatest_fixpoint_ne'` accidentally being about the least fixpoint.
+* Add `Plain` instance for `|==> P` when `P` is plain.
+* Rename `bupd_plain` → `bupd_elim`.
+* Change notation for atomic updates and atomic accessors to use `<{ ... }>`
+  instead of `<< ... >>`. This avoids a conflict with Autosubst.
+
+**Changes in `proofmode`:**
+
+* The proof mode introduction patterns "<-" and "->" are considered
+  intuitionistic. This means that tactics such as `iDestruct ... as "->"` will
+  not dispose of hypotheses to perform the rewrite.
+* Remove tactic `iSolveTC` in favor of `tc_solve` in std++.
+* The result of `iCombine` is no longer computed with the `FromSep` typeclass,
+  but with a new `CombineSepAs` typeclass. If you provide custom `FromSep`
+  instances and use the `iCombine` tactic, you will need to define additional
+  `CombineSepAs` instances. This is done in preparation for making `iCombine`
+  combine propositions in ways that are not appropriate for how `FromSep` is used.
+  Note that `FromSep` is still used for determining the new goals when applying
+  the `iSplitL` and `iSplitR` tactics.
+* The `iCombine` tactic now accepts an (optional) 'gives' clause, with which one
+  can learn persistent facts from the combination of two hypotheses. One can
+  register such 'gives' clauses by providing instances of the new
+  `CombineSepGives` typeclass. The 'gives' clause is still experimental;
+  in future versions of Iris it will combine `own` connectives based on the
+  validity rules for cameras.
+* Make sure that `iStartProof` fails with a proper error message on goals with
+  `let`. These `let`s should either be `simpl`ed or introduced into the Coq
+  context using `intros x`, `iIntros (x)`, or `iIntros "%x"`.
+  This can break some proofs that did `iIntros "?"` on a goal of the shape
+  `let ... in P ⊢ Q`.
+* Make `iApply`/`iPoseProof`/`iDestruct` more reliable for lemmas whose
+  statement involves `let`.
+* Remove `string_to_ident`; use `string_to_ident_cps` instead which is in CPS
+  form and hence does not require awful hacks.
+* The `iFrame` tactic now removes some conjunctions and disjunctions with `False`,
+  since additional `MakeOr` and `MakeAnd` instances were provided. If you use these
+  classes, their results may have become more concise.
+* Support n-ary versions of `iIntros`, `iRevert`, `iExists`, `iDestruct`, `iMod`,
+  `iFrame`, `iRevertIntros`, `iPoseProof`, `iInduction`, `iLöb`, `iInv`, and
+  `iAssert`. (by Jan-Oliver Kaiser and Rodolphe Lepigre)
+* Add tactics `ltac1_list_iter` and `ltac1_list_rev_iter` to iterate over
+  lists of `ident`s/`simple intropatterns`/`constr`/etc using Ltac1. See
+  [proofmode/base.v](iris/proofmode/base.v) for documentation on how
+  to use these tactics to convert your own fixed arity tactics to an n-ary
+  variant.
+* Improve the `IntoPure` instance for internal equality. Whenever possible,
+  `a ≡ b` will now be simplified to `a = b` upon introduction into the pure 
+  context. This will break but simplify some existing proofs: 
+  `iIntros (H%leibniz_equiv)` should be replaced by `iIntros (H)`. (by Ike Mulder)
+
+**Changes in `base_logic`:**
+
+* Add `mono_Z` library for monotone non-negative integers.
+  (This has exactly the same lemmas as `mono_nat`. It is useful in cases
+  where one wants to avoid `nat` entirely and use `Z` throughout.)
+* Add `IsExcept0` instance for invariants, allowing you to remove laters of
+  timeless hypotheses when proving an invariant (without an update).
+* Make `uPred.unseal` tactic more robust by using types to unfold the right
+  BI projections.
+* Turn `internal_eq_entails` into a bi-implication.
+* Add lemmas to relate internal/external non-expansiveness and contractiveness.
+* Refactor soundness lemmas: `bupd_plain_soundness` → `bupd_soundness`,
+  `soundness` → `laterN_soundness` + `pure_soundness`; removed
+  `consistency_modal`.
+* Strengthen `cmra_valid_elim` to `✓ a ⊢ ⌜ ✓{0} a ⌝`; make `discrete_valid` a
+  derived law.
+* Remove `frac_validI`. Instead, move to the pure context (with `%` in the proof
+  mode or `uPred.discrete_valid` in manual proofs) and use `frac_valid`.
+
+**Changes in `program_logic`:**
+
+* Change the notation for logically atomic triples: we add support for specifying private (non-atomic) postconditions,
+  and we avoid a notation conflict with Autosubst. The new notation looks as follows:
+  `<<{ ∀∀ x, atomic_pre x }>> code @ ∅ <<{ ∃∃ y, atomic_post x y | z, RET v, non_atomic_post x y z }>>`.
+  To keep the notation without private postcondition consistent, the way the return value is specified changes slightly
+  even when there is no private postcondition:
+  `<<{ ∀∀ x, atomic_pre x }>> code @ ∅ <<{ ∃∃ y, atomic_post x y | RET v }>>`.
+
+**Changes in `heap_lang`:**
+
+* Move operations and lemmas about locations into a module `Loc`.
+* Extend `wp_apply` and `wp_smart_apply` to support immediately introducing the
+  postcondition into the context via `as (x1 ... xn) "ipat1 ... ipatn"`.
+* Add comparison `≤` and `<` for locations. (by Arthur Azevedo de Amorim)
+* Make the generic `lock` interface a typeclass and make sure the lock code
+  does not depend on `Σ`. Code that is generic about lock implementations, or
+  that instantiates that specification, needs adjustment. See
+  [iris_heap_lang/lib/lock.v](iris_heap_lang/lib/lock.v) for documentation on
+  how to work with this specification.
+* Adjust the generic `atomic_heap` interface to follow the same pattern as
+  `lock`.
+* Add a generic `rwlock` interface and a spinning implementation.
+  (by Isaac van Bakel)
+
+**LaTeX changes:**
+
+- Rename `\Alloc` to `\AllocN` and `\Ref` to `\Alloc` for better consistency
+  with the Coq names and to avoid clash with hyperref package.
+
+The following `sed` script helps adjust your code to the renaming (on macOS,
+replace `sed` by `gsed`, installed via e.g. `brew install gnu-sed`).
+Note that the script is not idempotent, do not run it twice.
+```
+sed -i -E -f- $(find theories -name "*.v") <<EOF
+# iSolveTC
+s/iSolveTC\b/tc_solve/g
+# _alt -> _def
+s/\bsig_equiv_alt\b/sig_equiv_def/g
+s/\bsig_dist_alt\b/sig_dist_def/g
+# Loc
+s/\bloc_add(_assoc|_0|_inj|)\b/Loc.add\1/g
+s/\bfresh_locs(_fresh|)\b/Loc.fresh\1/g
+# unseal
+s/\bMonPred\.unseal\b/monPred\.unseal/g
+# big op
+s/\bbig_sepM2_alt\b/big_sepM2_alt_lookup/g
+s/\bbupd_plain\b/bupd_elim/g
+# Logical atomicity (will break Autosubst notation!)
+s/<<</<<\{/g
+s/>>>/\}>>/g
+# option and list
+s/\bdist_option_Forall2\b/option_dist_Forall2/g
+s/\blist_dist_cons_inv_r\b/cons_dist_eq/g
+EOF
+```
+
+The following sed script helps adjust LaTeX documents to these changes:
+Note that the script is not idempotent, do not run it twice.
+```
+sed -i -E -f- *.tex <<EOF
+# Alloc & Ref
+s/\\Alloc\b/\\AllocN/g
+s/\\Ref\b/\\Alloc/g
+EOF
+```
+
+
+## Iris 4.0.0 (2022-08-18)
+
+The highlight of Iris 4.0 is the *later credits* mechanism, which provides a new
+way to eliminate later modalities.
+
+This new mechanism complements the existing techniques of taking program steps,
+exploiting timelessness, and various modality commuting rules. At each program
+step, one obtains a credit `£ 1`, which is an ownable Iris resource. These
+credits don't have to be used at the present step, but can be saved up, and used
+to eliminate laters at any point in the verification using the fancy update
+modality. Later credits are particularly useful in proofs where there is not a
+one-to-one correspondence between program steps and later eliminations, for
+example, logical atomicity proofs. As a consequence, we have been able to
+simplify the definition of logical atomicity by removing the 'laterable'
+mechanism.
+
+The later credit mechanism is described in detail in the
+[ICFP'22 paper](https://plv.mpi-sws.org/later-credits/) and there is a
+[small tutorial](https://gitlab.mpi-sws.org/iris/iris/-/blob/iris-4.0.0/tests/later_credits_paper.v)
+in the Iris repository. The
+[examples](https://gitlab.mpi-sws.org/iris/examples/) repository contains some
+logically atomic case studies that make use of later credits: the counter with a
+backup (Section 4 of the later credits paper), as well as the elimination stack,
+conditional increment, and RDCSS.
+
+Iris 4.0 supports Coq 8.13 - 8.16.
+
+This release was managed by Ralf Jung, Robbert Krebbers, and Lennard Gäher, with
+contributions from Glen Mével, Gregory Malecha, Ike Mulder, Irene Yoon,
+Jan-Oliver Kaiser, Jonas Kastberg Hinrichsen, Lennard Gäher, Michael Sammler,
+Niklas Mück, Paolo G. Giarrusso, Ralf Jung, Robbert Krebbers, Simon Spies,
+and Tej Chajed. Thanks a lot to everyone involved!
+
+**General changes:**
+
+- Rename "unsealing" lemmas from `_eq` to `_unseal`. This particularly
+  affects `envs_entails_eq`, which is commonly used in the definition of
+  custom proof mode tactics. All other unsealing lemmas should be internal, so
+  in principle you should not rely on them.
+- Rename `coq-iris-staging` package to `coq-iris-unstable`, and also change the
+  import path from `iris.staging` to `iris.unstable`.
+
+**Changes in `algebra`:**
+
+* Add some missing algebra functors: `dfrac_agreeRF`, `excl_authURF`, `excl_authRF`,
+  `frac_authURF`, `frac_authRF`, `ufrac_authURF`, `ufrac_authRF`, `max_prefix_listURF`,
+  `max_prefix_listRF`, `mono_listURF`, and `mono_listRF`.
+* Make validy lemmas for `excl_auth` more consistent with `auth`.
+  - Rename `excl_auth_frag_validN_op_1_l` into `excl_auth_frag_op_validN` and
+    `excl_auth_frag_valid_op_1_l` into `excl_auth_frag_op_valid` (similar to
+    `auth_auth_op_valid`), and make them bi-implications.
+  - Add `excl_auth_auth_op_validN` and `excl_auth_auth_op_valid`.
+* Make validy lemmas for `(u)frac_auth` more consistent with `auth`.
+  - Remove unidirectional lemmas with `1` fraction `frac_auth_frag_validN_op_1_l`
+    and `frac_auth_frag_valid_op_1_l`
+  - Add `frac_auth_frag_op_validN` and `frac_auth_frag_op_valid`, which are
+    bi-implications with arbitrary fractions.
+  - Add `ufrac_auth_frag_op_validN` and `ufrac_auth_frag_op_valid`.
+* Remove `mono_list_lb_is_op` instance for `IsOp' (◯ML l) (◯ML l) (◯ML l)`; we
+  don't usually have such instances for duplicable resources and it was added by
+  accident.
+* Rename `pos_op_plus` into `pos_op_add`.
+
+**Changes in `bi`:**
+
+* Generalize `big_op` lemmas that were previously assuming `Absorbing`ness of
+  some assertion: they now take any of (`TCOr`) an `Affine` instance or an
+  `Absorbing` instance. This breaks uses where an `Absorbing` instance was
+  provided without relying on TC search (e.g. in `by apply ...`; a possible fix
+  is `by apply: ...`). (by Glen Mével, Bedrock Systems)
+* Change statement of `affinely_True_emp` to also remove the affinely modality.
+* Rename `absorbingly_True_emp` to `absorbingly_emp_True` and make statement
+  consistent with `affinely_True_emp`: `<absorb> emp ⊣⊢ True`.
+* Change the notation for atomic updates and atomic accessors (`AU`, `AACC`) to
+  swap the quantifiers: the first quantifier is logically an existential, the
+  second a universal, so let's use the appropriate notation. Also use double
+  quantifiers (`∀∀`, `∃∃`) to make it clear that these are not normal
+  quantifiers (the latter change was also applied to logically atomic triples).
+* Add some lemmas to show properties of functions defined via monotonoe fixpoints:
+  `least_fixpoint_affine`, `least_fixpoint_absorbing`,
+  `least_fixpoint_persistent_affine`, `least_fixpoint_persistent_absorbing`,
+  `greatest_fixpoint_absorbing`.
+* Rename `laterN_plus` into `laterN_add`.
+* Remove `make_laterable` from atomic updates. This relies on Iris now having
+  support for later credits (see below).
+* Add `Fractional` and `AsFractional` instances for `embed` such that the
+  embedding of something fractional is also fractional. (by Simon Friis Vindum).
+
+**Changes in `proofmode`:**
+
+* Change `iAssumption` to no longer instantiate evar premises with `False`. This
+  used to occur when the conclusion contains variables that are not in scope of
+  the evar, thus blocking the default behavior of instantiating the premise with
+  the conclusion. The old behavior can be emulated with`iExFalso. iExact "H".`
+* In `iInduction`, support induction schemes that involve `Forall` and
+  `Forall2` (for example, for trees with finite branching).
+* Change `iRevert` of a pure hypothesis to generate a magic wand instead of an
+  implication.
+* Change `of_envs` such that when the persistent context is empty, the
+  persistence modality no longer appears at all. This is a step towards using
+  the proofmode in logics without a persistence modality.
+  The lemma `of_envs_alt` shows equivalence with the old version.
+* Adjust `IntoWand` instances for non-affine BIs: in many cases where
+  `iSpecialize`/`iApply` of an implication previously failed, it will now
+  instead add an `<affine>` modality to the newly generated goal. In some rare
+  cases it might stop working or add an `<affine>` modality where previously
+  none was added.
+
+**Changes in `base_logic`:**
+
+* Make the `inG` instances for `libG` fields local, so they are only used inside
+  the library that defines the `libG`.
+* Add infrastructure for supporting later credits, by adding a resource `£ n`
+  describing ownership of `n` credits that can be eliminated at fancy updates.
+  + To retain backwards compatibility with the interaction laws of fancy updates
+    with the plainly modality (`BiFUpdPlainly`), which are incompatible with
+    later credits, the logic has a new parameter of type `has_lc`, which is
+    either `HasLc` or `HasNoLc`. The parameter is an index of the `invGS_gen`
+    typeclass; the old `invGS` is an alias for `invGS_gen HasLc` so that
+    developments default to having later credits available. Libraries that want
+    to be generic over whether credits are available or not, and proofs that
+    need `BiFUpdPlainly`, need to be changed to use `invGS_gen` rather than
+    `invGS`.
+  + The core soundness lemma `step_fupdN_soundness_gen` similarly takes a `has_lc`
+    parameter to control how the logic is supposed to be instantiated. The lemma
+    always generates credits, but they cannot be used in any meaningful way unless
+    `HasLc` is picked.
+* Add discardable fractions `dfrac` to `saved_anything_own`, `saved_prop_own`,
+  and `saved_pred_own`, so they can be updated. The previous persistent versions
+  can be recovered with the fraction `DfracDiscarded`. Allocation lemmas now take
+  a `dq` parameter to define the initial fraction.
+* Remove an unused fraction argument to `dfrac_valid_discarded`.
+
+**Changes in `program_logic`:**
+
+* The definition of the weakest precondition has been changed to generate later credits
+  (see `base_logic`) for each step:
+  + The member `num_laters_per_step` of the `irisGS` class now also determines the number
+    of later credits that are generated: `S (num_laters_per_step ns)` if `ns` steps
+    have been taken.
+  + The weakest precondition offers credits after a `prim_step` has been proven.
+  + All lifting lemmas have been altered to provide credits.
+    `wp_lift_step_fupdN` provides `S (num_laters_per_step ns)` credits, while all other
+    lemmas always provide one credit.
+* In line with the support for later credits (see `base_logic`), `irisGS_gen`
+  now also has a `has_lc` parameter and the adequacy statements have been
+  changed to account for that:
+  + The lemma `twp_total` (total adequacy) provides `irisGS_gen HasNoLc`. Clients
+    of the adequacy proof will need to make sure to be either generic over the
+    choice of `has_lc` or explicitly opt-out of later credits.
+  + The adequacy lemmas for the partial WP, in particular `wp_adequacy`,
+    `wp_strong_adequacy` and `wp_invariance`, are now available in two flavors:
+    the old names generate `irisGS` (a short-hand for `irisGS_gen HasLc`); new
+    lemmas with a `_gen` suffix leave the choice of `has_lc` to the user.
+  + The parameter for the stuckness bit `s` in `wp_strong_adequacy{_lc, _no_lc}` has
+    moved up and is now universally quantified in the lemma instead of being existentially
+    quantified at the Iris-level. For clients that already previously quantified over `s`
+    at the Coq level, the only required change should be to remove the instantiation
+    of the existential quantifier.
+
+**Changes in `iris_heap_lang`:**
+
+* Change the `num_laters_per_step` of `heap_lang` to `λ n, n`, signifying that
+  each step of the weakest precondition strips `n` laters, where `n` is the
+  number of steps taken so far. This number is tied to ghost state in the state
+  interpretation, which is exposed, updated, and used with new lemmas
+  `wp_lb_init`, `wp_lb_update`, and `wp_step_fupdN_lb`. (by Jonas Kastberg Hinrichsen)
+* Make pattern argument of `wp_pure` tactic optional (defaults to wildcard
+  pattern, matching all redexes).
+* In line with the support for later credits (see `base_logic`), the tactic
+  `wp_pure` now takes an optional parameter `credit:"H"` which generates a
+  hypothesis `H` for a single later credit `£ 1` that can be eliminated using
+  `lc_fupd_elim_later`.
+  The typeclass `heapGS_gen` now takes an additional `has_lc` parameter, and
+  `heapGS` is a short-hand for `heapGS_gen HasLc`. The adequacy statements for
+  HeapLang have been changed accordingly:
+  + `heap_adequacy` provides `heapGS`, thus enabling the use of later credits.
+    This precludes usage of the laws in `BiFUpdPlainly` in the HeapLang instance of Iris.
+  + `heap_total` provides `heapGS_gen HasNoLc`.
+
+The following `sed` script helps adjust your code to the renaming (on macOS,
+replace `sed` by `gsed`, installed via e.g. `brew install gnu-sed`).
+Note that the script is not idempotent, do not run it twice.
+```
+sed -i -E -f- $(find theories -name "*.v") <<EOF
+# excl_auth
+s/\bexcl_auth_frag_validN_op_1_l\b/excl_auth_frag_op_validN/g
+s/\bexcl_auth_frag_valid_op_1_l\b/excl_auth_frag_op_valid/g
+# staging → unstable
+s/\biris\.staging\b/iris.unstable/g
+# plus → add
+s/\blaterN_plus\b/laterN_add/g
+s/\bpos_op_plus\b/pos_op_add/g
+EOF
+```
+
+## Iris 3.6.0 (2022-01-22)
+
+The highlights and most notable changes of this release are:
+
+* Coq 8.15 is now supported, while Coq 8.13 and Coq 8.14 remain supported.
+  Coq 8.12 is no longer supported.
+* Support for discardable fractions (`dfrac`) has been added to `gmap_view`
+  authoritative elements, and to the `mono_nat` library. See below for other
+  `dfrac`-related changes.
+* A new `mono_list` algebra provides monotonically growing lists with an
+  exclusive authoritative element and persistent prefix witnesses. See
+  `iris/algebra/lib/mono_list.v` for details. An experimental logic-level
+  library wrapping the algebra is available at
+  `iris_staging/base_logic/mono_list.v`; if you use it, please give feedback on
+  the tracking issue
+  [iris/iris#439](https://gitlab.mpi-sws.org/iris/iris/-/issues/439).
+
+This release was managed by Ralf Jung, Robbert Krebbers, and Tej Chajed, with
+contributions from Dan Frumin, Jonas Kastberg Hinrichsen, Lennard Gäher,
+Matthieu Sozeau, Michael Sammler, Paolo G. Giarrusso, Ralf Jung, Robbert
+Krebbers, Simon Friis Vindum, Tej Chajed, and Vincent Siles. Thanks a lot to
+everyone involved!
+
+**Changes in `algebra`**
+
+* Define non-expansive instance for `dom`. This, in particular, makes it
+  possible to `iRewrite` below `dom` (even if the `dom` appears in `⌜ _ ⌝`).
+* Generalize the authoritative elements of `gmap_view` to be parameterized by a
+  [discardable fraction](iris/algebra/dfrac.v) (`dfrac`) instead of a fraction
+  (`frac`). Lemmas affected by this have been renamed such that the "frac" in
+  their name has been changed into "dfrac". (by Simon Friis Vindum)
+* Change `ufrac_auth` notation to not use curly braces, since these fractions do
+  not behave like regular fractions (and cannot be made `dfrac`).
+  Old: `●U{q} a`, `◯U{q} b`; new: `●U_q a`, `◯U_q b`.
+* Equip `frac_agree` with support for `dfrac` and rename it to `dfrac_agree`.
+  The old `to_frac_agree` and its lemmas still exist, except that the
+  `frac_agree_op_valid` lemmas are made bi-directional.
+* Rename typeclass instance `Later_inj` -> `Next_inj`.
+* Remove `view_auth_frac_op`, `auth_auth_frac_op`, `gmap_view_auth_frac_op`; the
+  corresponding `dfrac` lemmas can be used instead (together with `dfrac_op_own`
+  if needed).
+* Equip `mono_nat` algebra with support for `dfrac`, make API more consistent,
+  and add notation for algebra elements. See `iris/algebra/lib/mono_nat.v` for
+  details. This affects some existing terms and lemmas:
+  - `mono_nat_auth` now takes a `dfrac`, but the recommendation is to port to the notation.
+  - `mono_nat_lb_op`: direction of equality is swapped.
+  - `mono_nat_auth_frac_op`, `mono_nat_auth_frac_op_valid`,
+    `mono_nat_auth_frac_valid`, `mono_nat_both_frac_valid`: use `dfrac` variant
+    instead.
+* Add `mono_list` algebra for monotonically growing lists with an exclusive
+  authoritative element and persistent prefix witnesses. See
+  `iris/algebra/lib/mono_list.v` for details.
+
+**Changes in `bi`:**
+
+* Rename `least_fixpoint_ind` into `least_fixpoint_iter`,
+  rename `greatest_fixpoint_coind` into `greatest_fixpoint_coiter`,
+  rename `least_fixpoint_strong_ind` into `least_fixpoint_ind`,
+  add lemmas `least_fixpoint_{ind_wf, ne', strong_mono}`, and
+  add lemmas `greatest_fixpoint_{coind, paco, ne', strong_mono}`.
+* Move `persistently_forall_2` (`∀ <pers> ⊢ <pers> ∀`) out of the BI interface
+  into a new typeclass, `BiPersistentlyForall`. The BI interface instead just
+  demands the equivalent property for conjunction (`(<pers> P) ∧ (<pers> Q) ⊢
+  <pers> (P ∧ Q)`). This enables the IPM to support logics where the
+  persistently modality is defined with an existential quantifier. This also
+  necessitates removing `persistently_impl_plainly` from `BiPlainly` into a new
+  typeclass `BiPersistentlyImplPlainly`.
+  Proofs that are generic in `PROP` might have to add those new classes as
+  assumptions to remain compatible, and code that instantiates the BI interface
+  needs to provide instances for the new classes.
+* Make `frame_fractional` not an instance any more; instead fractional
+  propositions that want to support framing are expected to register an
+  appropriate instance themselves. HeapLang and gen_heap `↦` still support
+  framing, but the other fractional propositions in Iris do not.
+* Strengthen the `Persistent`/`Affine`/`Timeless` results for big ops. Add a `'`
+  to the name of the weaker results, which remain to be used as instances.
+
+**Changes in `heap_lang`:**
+
+* The `is_closed_expr` predicate is formulated in terms of a
+  set of binders (as opposed to a list of binders).
+
+The following `sed` script helps adjust your code to the renaming (on macOS,
+replace `sed` by `gsed`, installed via e.g. `brew install gnu-sed`).
+Note that the script is not idempotent, do not run it twice.
+```
+sed -i -E -f- $(find theories -name "*.v") <<EOF
+# least/greatest fixpoint renames
+s/\bleast_fixpoint_ind\b/least_fixpoint_iter/g
+s/\bgreatest_fixpoint_coind\b/greatest_fixpoint_coiter/g
+s/\bleast_fixpoint_strong_ind\b/least_fixpoint_ind/g
+# gmap_view renames from frac to dfrac
+s/\bgmap_view_(auth|both)_frac_(op_invN|op_inv|op_inv_L|valid|op_validN|op_valid|op_valid_L)\b/gmap_view_\1_dfrac_\2/g
+s/\bgmap_view_persist\b/gmap_view_frag_persist/g
+# frac_agree with dfrac
+s/\bfrac_agreeR\b/dfrac_agreeR/g
+EOF
+```
+
+## Iris 3.5.0 (2021-11-05)
+
+The highlights and most notable changes of this release are:
+
+* Coq 8.14 is now supported, while Coq 8.12 and Coq 8.13 remain supported.
+* The proof mode now has native support for pure names `%H` in intro patterns,
+  without installing
+  [iris/string-ident](https://gitlab.mpi-sws.org/iris/string-ident). If you had
+  the plugin installed, to migrate simply uninstall the plugin and stop
+  importing it.
+* The proof mode now supports destructing existentials with the `"[%x ...]"`
+  pattern.
+* `iMod` and `iModIntro` now report an error message for mask mismatches.
+* Performance improvements for the proof mode in `iFrame` in non-affine
+  logics, `iPoseProof`, and `iDestruct` (by Paolo G. Giarrusso, Bedrock Systems,
+  and Armaël Guéneau).
+* The new `ghost_map` logic-level library supports a ghost `gmap K V` with an
+  authoritative view and per-element points-to facts written `k ↪[γ] w`.
+* Weakest preconditions now support a flexible number of laters per
+  physical step of the operational semantics. See merge request
+  [!585](https://gitlab.mpi-sws.org/iris/iris/-/merge_requests/595) (by
+  Jacques-Henri Jourdan and Yusuke Matsushita).
+* HeapLang now has an atomic `Xchg` (exchange) operation (by Simon Hudon,
+  Google).
+
+This release was managed by Ralf Jung, Robbert Krebbers, and Tej Chajed, with
+contributions from Amin Timany, Armaël Guéneau, Dan Frumin, Dmitry Khalanskiy,
+Hoang-Hai Dang, Jacques-Henri Jourdan, Lennard Gäher, Michael Sammler, Paolo G.
+Giarrusso, Ralf Jung, Robbert Krebbers, Simon Friis Vindum, Simon Hudon, Tej
+Chajed, and Yusuke Matsushita. Thanks a lot to everyone involved!
+
+**Changes in `algebra`:**
+
+* Generalize the authoritative elements of the `view`, `auth` and `gset_bij`
+  cameras to be parameterized by a [discardable fraction](iris/algebra/dfrac.v)
+  (`dfrac`) instead of a fraction (`frac`). Normal fractions are now denoted
+  `●{#q} a` and `●V{#q} a`. Lemmas affected by this have been renamed such that
+  the "frac" in their name has been changed into "dfrac". (by Simon Friis Vindum)
+* Generalize `namespace_map` to `reservation_map` which enhances `gmap positive
+  A` with a notion of 'tokens' that enable allocating a particular name in the
+  map. See [algebra.reservation_map](iris/algebra/reservation_map.v) for further
+  information.
+* Add `dyn_reservation_map` which further extends `reservation_map` with the
+  ability to dynamically allocate an infinite set of tokens. This is useful to
+  perform synchronized allocation of the same name in two maps/APIs without
+  dedicated support from one of the involved maps/APIs. See
+  [algebra.dyn_reservation_map](iris/algebra/dyn_reservation_map.v) for further
+  information.
+* Demote the Camera structure on `list` to `iris_staging` since its composition
+  is not very well-behaved.
+* Extend `gmap_view` with lemmas for "big" operations on maps.
+* Typeclasses instances triggering a canonical structure search such as `Equiv`,
+  `Dist`, `Op`, `Valid`, `ValidN`, `Unit`, `PCore` now use an `Hint Extern`
+  based on `refine` instead of `apply`, in order to use Coq's newer unification
+  algorithm.
+* Set `Hint Mode` for the classes `OfeDiscrete`, `Dist`, `Unit`, `CmraMorphism`,
+  `rFunctorContractive`, `urFunctorContractive`.
+* Set `Hint Mode` for the stdpp class `Equiv`. This might require few spurious
+  type annotations until
+  [Coq bug #14441](https://github.com/coq/coq/issues/14441) is fixed.
+* Add `max_prefix_list` RA on lists whose composition is only defined when one
+  operand is a prefix of the other. The result is the longer list.
+* Add `NonExpansive` instances for `curry` and friends.
+
+**Changes in `bi`:**
+
+* Add new lemmas `big_sepM2_delete_l` and `big_sepM2_delete_r`.
+* Rename `big_sepM2_lookup_1` → `big_sepM2_lookup_l` and
+  `big_sepM2_lookup_2` → `big_sepM2_lookup_r`.
+* Add lemmas for swapping nested big-ops: `big_sep{L,M,S,MS}_sep{L,M,S,MS}`.
+* Rename `big_sep{L,L2,M,M2,S}_intuitionistically_forall` →
+  `big_sep{L,L2,M,M2,S}_intro`, and `big_orL_lookup` → `big_orL_intro`.
+* Rename `bupd_forall` to `bupd_plain_forall`, and add
+  `{bupd,fupd}_{and,or,forall,exist}`.
+* Decouple `Wp` and `Twp` typeclasses from the `program_logic.language`
+  interface. The typeclasses are now parameterized over an expression and a
+  value type, instead of a language. This requires extra type annotations or
+  explicit coercions in a few cases, in particular `WP v {{ Φ }}` must now be
+  written `WP (of_val v) {{ Φ }}`.
+* Improve `make_laterable`:
+  - Adjust definition such that `Laterable P` iff `P ⊢ make_laterable P`.
+    As a consequence, `make_laterable_elim` got weaker: elimination now requires
+    an except-0 modality (`make_laterable P -∗ ◇ P`).
+  - Add `iModIntro` support for `make_laterable`.
+* Improvements to `BiMonoPred`:
+  - Use `□`/`-∗` instead of `<pers>`/`→`.
+  - Strengthen to ensure that functions for recursive calls are non-expansive.
+* Add `big_andM` (big conjunction on finite maps) with lemmas similar to `big_andL`.
+* Add transitive embedding that constructs an embedding of `PROP1` into `PROP3`
+  by combining the embeddings of `PROP1` into `PROP2` and `PROP2` into `PROP3`.
+  This construct is *not* declared as an instance to avoid TC search divergence.
+  (by Hai Dang, BedRock Systems)
+* Improve notation printing around magic wands, view shifts, `WP`, Texan
+  triples, and logically atomic triples.
+* Slight change to the `AACC` notation for atomic accessors (which is usually
+  only printed, not parsed): added a `,` before `ABORT`, for consistency with `COMM`.
+* Add the lemmas `big_sepM_impl_strong` and `big_sepM_impl_dom_subseteq` that
+  generalize the existing `big_sepM_impl` lemma. (by Simon Friis Vindum)
+* Add new instance `fractional_big_sepL2`. (by Paolo G. Giarrusso, BedRock Systems)
+
+**Changes in `proofmode`:**
+
+* Add support for pure names `%H` in intro patterns. This is now natively
+  supported whereas the previous experimental support required installing
+  https://gitlab.mpi-sws.org/iris/string-ident. (by Tej Chajed)
+* Add support for destructing existentials with the intro pattern `[%x ...]`.
+  (by Tej Chajed)
+* `iMod`/`iModIntro` show proper error messages when they fail due to mask
+  mismatches. To support this, the proofmode typeclass `FromModal` now takes an
+  additional pure precondition.
+* Fix performance of `iFrame` in logics without `BiAffine`.
+  To adjust your code if you use such logics and define `Frame` instances,
+  ensure these instances to have priority at least 2: they should have either at
+  least 2 (non-dependent) premises, or an explicit priority.
+  References: docs for `frame_here_absorbing` in
+  [iris/proofmode/frame_instances.v](iris/proofmode/frame_instances.v) and
+  https://coq.inria.fr/refman/addendum/type-classes.html#coq:cmd.Instance. (by
+  Paolo G. Giarrusso, BedRock Systems)
+* Rename the main entry point module for the proofmode from
+  `iris.proofmode.tactics` to `iris.proofmode.proofmode`. Under normal
+  circumstances, this should be the only proofmode file you need to import.
+* Improve performance of the `iIntoEmpValid` tactic used by `iPoseProof`,
+  especially in the case of large goals and lemmas with many forall quantifiers.
+  (by Armaël Guéneau)
+* Improve performance of the `iDestruct` tactic, by using user-provided names
+  more eagerly in order to avoid later calls to `iRename`.
+  (by Armaël Guéneau)
+
+**Changes in `bi`:**
+
+* Add lemmas characterizing big-ops over pure predicates (`big_sep*_pure*`).
+* Move `BiAffine`, `BiPositive`, `BiLöb`, and `BiPureForall` from
+  `bi.derived_connectives` to `bi.extensions`.
+* Strengthen `persistent_fractional` to support propositions that are persistent
+  and either affine or absorbing. (by Paolo G. Giarrusso, BedRock Systems)
+
+**Changes in `base_logic`:**
+
+* Add `ghost_map`, a logic-level library for a `gmap K V` with an authoritative
+  view and per-element points-to facts written `k ↪[γ] w`.
+* Generalize the soundness lemma of the base logic `step_fupdN_soundness`.
+  It applies even if invariants stay open across an arbitrary number of laters.
+  (by Jacques-Henri Jourdan)
+* Rename those `*G` typeclasses that must be global singletons to `*GS`, and
+  their corresponding `preG` class to `GpreS`. Affects `invG`, `irisG`,
+  `gen_heapG`, `inv_heapG`, `proph_mapG`, `ownPG`, `heapG`.
+
+**Changes in `program_logic`:**
+
+* Change definition of weakest precondition to use a variable number of laters
+  (i.e., logical steps) for each physical step of the operational semantics,
+  depending on the number of physical steps executed since the beginning of the
+  execution of the program. See merge request [!595](https://gitlab.mpi-sws.org/iris/iris/-/merge_requests/595).
+  This implies several API-breaking changes, which can be easily fixed in client
+  formalizations in a backward compatible manner as follows:
+   - Ignore the new parameter `ns` in the state interpretation, which
+     corresponds to a step counter.
+   - Use the constant function "0" for the new field `num_laters_per_step` of
+     `irisG`.
+   - Use `fupd_intro _ _` for the new field `state_interp_mono` of `irisG`.
+   - Some proofs using lifting lemmas and adequacy theorems need to be adapted
+     to ignore the new step counter.
+  (by Jacques-Henri Jourdan)
+* Remove `wp_frame_wand_l`; add `wp_frame_wand` as more symmetric replacement.
+* Swap the polarity of the mask in logically atomic triples, so that it matches
+  regular `WP` masks.
+* Rename `iris_invG` to `iris_invGS`.
+
+**Changes in `heap_lang`:**
+
+* Rename `Build_loc` constructor for `loc` type to `Loc`.
+* Add atomic `Xchg` ("exchange"/"swap") operation. (by Simon Hudon, Google LLC)
+
+The following `sed` script helps adjust your code to the renaming (on macOS,
+replace `sed` by `gsed`, installed via e.g. `brew install gnu-sed`).
+Note that the script is not idempotent, do not run it twice.
+```
+sed -i -E -f- $(find theories -name "*.v") <<EOF
+# auth and view renames from frac to dfrac
+s/\b(auth|view)_(auth|both|update)_frac_(is_op|op_invN|op_inv|inv_L|validN|op_validN|valid|op_valid|valid_2|valid_discrete|includedN|included|alloc|validI|validI_2|validI_1|validI|)\b/\1_\2_dfrac_\3/g
+s/\bgset_bij_auth_frac_(\w*)\b/gset_bij_auth_dfrac_\1/g
+s/\bgset_bij_auth_empty_frac_valid\b/gset_bij_auth_empty_dfrac_valid/g
+s/\bbij_both_frac_valid\b/bij_both_dfrac_valid/g
+# big_sepM renames
+s/\bbig_sepM2_lookup_1\b/big_sepM2_lookup_l/g
+s/\bbig_sepM2_lookup_2\b/big_sepM2_lookup_r/g
+# big_*_intro
+s/\bbig_sep(L|L2|M|M2|S)_intuitionistically_forall\b/big_sep\1_intro/g
+s/\bbig_orL_lookup\b/big_orL_intro/g
+s/\bbupd_forall\b/bupd_plain_forall/g
+# "global singleton" rename
+s/\b(inv|iris|(gen|inv)_heap|(Gen|Inv)Heap|proph_map|ProphMap|[oO]wnP|[hH]eap)G\b/\1GS/g
+s/\b([iI]nv|iris|(gen|inv)_heap|(Gen|Inv)Heap|proph_map|ProphMap|[oO]wnP|[hH]eap)PreG\b/\1GpreS/g
+# iris.proofmode.tactics → iris.proofmode.proofmode
+s/\bproofmode\.tactics\b/proofmode.proofmode/
+s/(From +iris\.proofmode +Require +(Import|Export).*)\btactics\b/\1proofmode/
+# iris_invG → iris_invGS
+s/\biris_invG\b/iris_invGS/g
+EOF
+```
+
+## Iris 3.4.0 (released 2021-02-16)
+
+The highlights and most notable changes of this release are as follows:
+* Coq 8.13 is now supported; the old Coq 8.9 and Coq 8.10 are not supported any
+  more.
+* The new `view` RA construction generalizes `auth` to user-defined abstraction
+  relations. (thanks to Gregory Malecha for the inspiration)
+* The new `dfrac` RA extends `frac` (fractions `0 < q ≤ 1`) with support for
+  "discarding" some part of the fraction in exchange for a persistent witness
+  that discarding has happened. This can be used to easily generalize fractional
+  permissions with support for persistently owning "any part" of the resource.
+  (by Simon Friis Vindum)
+* The new `gmap_view` RA provides convenient lemmas for ghost ownership
+  of heap-like structures with an "authoritative" view. Thanks to `dfrac`, it
+  supports both exclusive (mutable) and persistent (immutable) ownership of
+  individual map elements.
+* With this release we are beginning to provide logic-level abstractions for
+  ghost state, which have the advantage that the user does not have to directly
+  interact with RAs to use them.
+  - `ghost_var` provides a logic-level abstraction of ghost variables: a mutable
+    "variable" with fractional ownership.
+  - `mono_nat` provides a "monotone counter" with a persistent witnesses
+    representing a lower bound of the current counter value. (by Tej Chajed)
+  - `gset_bij` provides a monotonically growing partial bijection; this is
+    useful in particular when building binary logical relations for languages
+    with a heap.
+* HeapLang provides a persistent read-only points-to assertion `l ↦□ v`.
+  (by Simon Friis Vindum)
+* We split Iris into multiple opam packages: `coq-iris` no longer contains
+  HeapLang, which is now in a separate package `coq-iris-heap-lang`. The two
+  packages `coq-iris-deprecated` (for old modules that we eventually plan to
+  remove entirely) and `coq-iris-staging` (for new modules that are not yet
+  ready for prime time) exist only as development versions, so they are not part
+  of this release.
+* The proofmode now does a better job at picking reasonable names when moving
+  variables into the Coq context without a name being explicitly given by the
+  user. However, the exact variable names remain unspecified. (by Tej Chajed)
+
+Further details are given in the changelog below.
+
+This release of Iris was managed by Ralf Jung and Robbert Krebbers, with
+contributions by Arthur Azevedo de Amorim, Dan Frumin, Enrico Tassi, Hai Dang,
+Michael Sammler, Paolo G. Giarrusso, Rodolphe Lepigre, Simon Friis Vindum, Tej
+Chajed, and Yusuke Matsushita.  Thanks a lot to everyone involved!
+
+**Changes in `algebra`:**
+
+* Add constructions to define a camera through restriction of the validity predicate
+  (`iso_cmra_mixin_restrict`) and through an isomorphism (`iso_cmra_mixin`).
+* Add a `frac_agree` library which encapsulates `frac * agree A` for some OFE
+  `A`, and provides some useful lemmas.
+* Add the view camera `view`, which generalizes the authoritative camera
+  `auth` by being parameterized by a relation that relates the authoritative
+  element with the fragments.
+* Add the camera of discardable fractions `dfrac`. This is a generalization of
+  the normal fractional camera.
+  See [algebra.dfrac](iris/algebra/dfrac.v) for further information.
+* Add `gmap_view`, a camera providing a "view of a `gmap`". The authoritative
+  element is any `gmap`; the fragment provides fractional ownership of a single
+  key, including support for persistent read-only ownership through `dfrac`.
+  See [algebra.lib.gmap_view](iris/algebra/lib/gmap_view.v) for further information.
+* Add `mono_nat`, a wrapper for `auth max_nat`. The result is an authoritative
+  `nat` where a fragment is a lower bound whose ownership is persistent.
+  See [algebra.lib.mono_nat](iris/algebra/lib/mono_nat.v) for further information.
+* Add the `gset_bij` resource algebra for monotone partial bijections.
+  See [algebra.lib.gset_bij](iris/algebra/lib/gset_bij.v) for further information.
+* Rename `agree_op_inv'` → `to_agree_op_inv`,
+  `agree_op_invL'` → `to_agree_op_inv_L`, and add `to_agree_op_invN`.
+* Rename `auth_auth_frac_op_invL` → `auth_auth_frac_op_inv_L`,
+  `excl_auth_agreeL` → `excl_auth_agree_L`,
+  `frac_auth_agreeL` → `frac_auth_agree_L`, and
+  `ufrac_auth_agreeL` → `ufrac_auth_agree_L`.
+* Fix direction of `auth_auth_validN` to make it consistent with similar lemmas,
+  e.g., `auth_auth_valid`. The direction is now `✓{n} (● a) ↔ ✓{n} a`.
+* Rename `auth_both_valid` to `auth_both_valid_discrete` and
+  `auth_both_frac_valid` to `auth_both_frac_valid_discrete`. The old name is
+  used for new, stronger lemmas that do not assume discreteness.
+* Redefine the authoritative camera in terms of the view camera. As part of this
+  change, we have removed lemmas that leaked implementation details. Hence, the
+  only way to construct elements of `auth` is via the elements `●{q} a` and
+  `◯ b`. The constructor `Auth`, and the projections `auth_auth_proj` and
+  `auth_frag_proj` no longer exist. Lemmas that referred to these constructors
+  have been removed, in particular: `auth_equivI`, `auth_validI`,
+  `auth_included`, `auth_valid_discrete`, and `auth_both_op`.  For validity, use
+  `auth_auth_valid*`, `auth_frag_valid*`, or `auth_both_valid*` instead.
+* Rename `auth_update_core_id` into `auth_update_frac_alloc`.
+* Rename `cmra_monotone_valid` into `cmra_morphism_valid` (this rename was
+  forgotten in !56).
+* Move the `*_validI` and `*_equivI` lemmas to a new module, `base_logic.algebra`.
+  That module is exported by `base_logic.base_logic` so it should usually be
+  available everywhere without further changes.
+* The authoritative fragment `✓ (◯ b : auth A)` is no longer definitionally
+  equal to `✓ b`.
+* Change `*_valid` lemma statements involving fractions to use `Qp` addition and
+  inequality instead of RA composition and validity (also in `base_logic` and
+  the higher layers).
+* Move `algebra.base` module to `prelude.prelude`.
+* Strengthen `cmra_op_discrete` to assume only `✓{0} (x1 ⋅ x2)` instead of `✓
+  (x1 ⋅ x2)`.
+* Rename the types `ofeT`→`ofe`, `cmraT`→`cmra`, `ucmraT`→`ucmra`, and the
+  constructors `OfeT`→`Ofe`, `CmraT`→`Cmra`, and `UcmraT`→`Ucmra` since the `T`
+  suffix is not needed. This change makes these names consistent with `bi`,
+  which also does not have a `T` suffix.
+* Rename typeclass instances of CMRA operational typeclasses (`Op`, `Core`,
+  `PCore`, `Valid`, `ValidN`, `Unit`) to have a `_instance` suffix, so that
+  their original names are available to use as lemma names.
+* Rename `frac_valid'`→`frac_valid`, `frac_op'`→`frac_op`,
+  `ufrac_op'`→`ufrac_op`, `coPset_op_union` → `coPset_op`, `coPset_core_self` →
+  `coPset_core`, `gset_op_union` → `gset_op`, `gset_core_self` → `gset_core`,
+  `gmultiset_op_disj_union` → `gmultiset_op`, `gmultiset_core_empty` →
+  `gmultiset_core`, `nat_op_plus` → `nat_op`, `max_nat_op_max` →
+  `max_nat_op`. Those names were previously blocked by typeclass instances.
+
+**Changes in `bi`:**
+
+* Add big op lemmas `big_op{L,L2,M,M2,S}_intuitionistically_forall` and
+  `big_sepL2_forall`, `big_sepMS_forall`, `big_sepMS_impl`, and `big_sepMS_dup`.
+* Add lemmas to big-ops that provide ownership of a single element and permit
+  changing the quantified-over predicate when re-assembling the big-op:
+  `big_sepL_lookup_acc_impl`, `big_sepL2_lookup_acc_impl`,
+  `big_sepM_lookup_acc_impl`, `big_sepM2_lookup_acc_impl`,
+  `big_sepS_elem_of_acc_impl`, `big_sepMS_elem_of_acc_impl`.
+* Add lemmas `big_sepM_filter'` and `big_sepM_filter` matching the corresponding
+  `big_sepS` lemmas.
+* Add lemmas for big-ops of magic wands: `big_sepL_wand`, `big_sepL2_wand`,
+  `big_sepM_wand`, `big_sepM2_wand`, `big_sepS_wand`, `big_sepMS_wand`.
+* Add notation `¬ P` for `P → False` to `bi_scope`.
+* Add `fupd_mask_intro` which can be conveniently `iApply`ed to goals of the
+  form `|={E1,E2}=>` to get rid of the `fupd` in the goal if `E2 ⊆ E1`. The
+  lemma `fupd_mask_weaken Enew` can be `iApply`ed to shrink the first mask to
+  `Enew` without getting rid of the modality; the same effect can also be
+  obtained slightly more conveniently by using `iMod` with `fupd_mask_subseteq
+  Enew`. To make the new names work, rename some existing lemmas:
+  `fupd_intro_mask` → `fupd_mask_intro_subseteq`,
+  `fupd_intro_mask'` → `fupd_mask_subseteq` (implicit arguments also changed
+  here), `fupd_mask_weaken` → `fupd_mask_intro_discard`. Remove `fupd_mask_same`
+  since it was unused and obscure.  In the `BiFUpd` axiomatization, rename
+  `bi_fupd_mixin_fupd_intro_mask` to `bi_fupd_mixin_fupd_mask_subseteq` and
+  weaken the lemma to be specifically about `emp` (the stronger version can be
+  derived).
+* Remove `bi.tactics` with tactics that predate the proofmode (and that have not
+  been working properly for quite some time).
+* Strengthen `persistent_sep_dup` to support propositions that are persistent
+  and either affine or absorbing.
+* Fix the statement of the lemma `fupd_plainly_laterN`; the old lemma was a
+  duplicate of `fupd_plain_laterN`.
+* Strengthen `big_sepL2_app_inv` by weakening a premise (it is sufficient for
+  one of the two pairs of lists to have equal length).
+* Rename `equiv_entails` → `equiv_entails_1_1`,
+  `equiv_entails_sym` → `equiv_entails_1_2`, and `equiv_spec` → `equiv_entails`.
+* Remove the laws `pure_forall_2 : (∀ a, ⌜ φ a ⌝) ⊢ ⌜ ∀ a, φ a ⌝` from the BI
+  interface and factor it into a type class `BiPureForall`.
+
+**Changes in `proofmode`:**
+
+* The proofmode now preserves user-supplied names for existentials when using
+  `iDestruct ... as (?) "..."`. This is backwards-incompatible if you were
+  relying on the previous automatic names (which were always "H", possibly
+  freshened). It also requires some changes if you were implementing `IntoExist`
+  yourself, since the typeclass now forwards names. If your instance transforms
+  one `IntoExist` into another, you can generally just forward the name from the
+  premise.
+* The proofmode also preserves user-supplied names in `iIntros`, for example
+  with `iIntros (?)` and `iIntros "%"`, as described for destructing
+  existentials above. As part of this change, it now uses a base name of `H` for
+  pure facts rather than the previous default of `a`. This also requires some
+  changes if you were implementing `FromForall`, in order to forward names.
+* Make `iFrame` "less" smart w.r.t. clean up of modalities. It now consistently
+  removes the modalities `<affine>`, `<absorbing>`, `<persistent>` and `□` only
+  if the result after framing is `True` or `emp`. In particular, it no longer
+  removes `<affine>` if the result after framing is affine, and it no longer
+  removes `□` if the result after framing is intuitionistic.
+* Allow framing below an `<affine>` modality if the hypothesis that is framed is
+  affine. (Previously, framing below `<affine>` was only possible if the
+  hypothesis that is framed resides in the intuitionistic context.)
+* Add Coq side-condition `φ` to class `ElimAcc` (similar to what we already had
+  for `ElimInv` and `ElimModal`).
+* Add a tactic `iSelect pat tac` (similar to `select` in std++) which runs the
+  tactic `tac H` with the name `H` of the last hypothesis of the intuitionistic
+  or spatial context matching `pat`. The tactic `iSelect` is used to implement:
+  + `iRename select (pat)%I into name` which renames the matching hypothesis,
+  + `iDestruct select (pat)%I as ...` which destructs the matching hypothesis,
+  + `iClear select (pat)%I` which clears the matching hypothesis,
+  + `iRevert select (pat)%I` which reverts the matching hypothesis,
+  + `iFrame select (pat)%I` which cancels the matching hypothesis.
+
+**Changes in `base_logic`:**
+
+* Add a `ghost_var` library that provides (fractional) ownership of a ghost
+  variable of arbitrary `Type`.
+* Define a ghost state library on top of the `mono_nat` resource algebra.
+  See [base_logic.lib.mono_nat](iris/base_logic/lib/mono_nat.v) for further
+  information.
+* Define a ghost state library on top of the `gset_bij` resource algebra.
+  See [base_logic.lib.gset_bij](iris/base_logic/lib/gset_bij.v) for further
+  information.
+* Extend the `gen_heap` library with read-only points-to assertions using
+  [discardable fractions](iris/algebra/dfrac.v).
+  + The `mapsto` connective now takes a `dfrac` rather than a `frac` (i.e.,
+    positive rational number `Qp`).
+  + The notation `l ↦{ dq } v` is generalized to discardable fractions
+    `dq : dfrac`.
+  + The new notation `l ↦{# q} v` is used for a concrete fraction `q : frac`
+    (e.g., to enable writing `l ↦{# 1/2} v`).
+  + The new notation `l ↦□ v` is used for the discarded fraction. This
+    persistent proposition provides read-only access to `l`.
+  + The lemma `mapsto_persist : l ↦{dq} v ==∗ l ↦□ v` is used for making the
+    location `l` read-only.
+  + See the [changes to HeapLang](https://gitlab.mpi-sws.org/iris/iris/-/merge_requests/554)
+    for an indication on how to adapt your language.
+  + See the [changes to iris-examples](https://gitlab.mpi-sws.org/iris/examples/-/commit/a8425b708ec51d918d5cf6eb3ab6fde88f4e2c2a)
+    for an indication on how to adapt your development. In particular, instead
+    of `∃ q, l ↦{q} v` you likely want to use `l ↦□ v`, which has the advantage
+    of being persistent (rather than just duplicable).
+* Change type of some ghost state lemmas (mostly about allocation) to use `∗`
+  instead of `∧` (consistent with our usual style).  This affects the following
+  lemmas: `own_alloc_strong_dep`, `own_alloc_cofinite_dep`, `own_alloc_strong`,
+  `own_alloc_cofinite`, `own_updateP`, `saved_anything_alloc_strong`,
+  `saved_anything_alloc_cofinite`, `saved_prop_alloc_strong`,
+  `saved_prop_alloc_cofinite`, `saved_pred_alloc_strong`,
+  `saved_pred_alloc_cofinite`, `auth_alloc_strong`, `auth_alloc_cofinite`,
+  `auth_alloc`.
+* Change `uPred_mono` to only require inclusion at the smaller step-index.
+* Put `iProp`/`iPreProp`-isomorphism into the `own` construction. This affects
+  clients that define higher-order ghost state constructions. Concretely, when
+  defining an `inG`, the functor no longer needs to be applied to `iPreProp`,
+  but should be applied to `iProp`. This avoids clients from having to push
+  through the `iProp`/`iPreProp`-isomorphism themselves, which is now handled
+  once and for all by the `own` construction.
+* Rename `gen_heap_ctx` to `gen_heap_interp`, since it is meant to be used in
+  the state interpretation of WP and since `_ctx` is elsewhere used as a suffix
+  indicating "this is a persistent assumption that clients should always have in
+  their context". Likewise, rename `proph_map_ctx` to `proph_map_interp`.
+* Move `uPred.prod_validI`, `uPred.option_validI`, and
+  `uPred.discrete_fun_validI` to the new `base_logic.algebra` module. That
+  module is exported by `base_logic.base_logic` so these names are now usually
+  available everywhere, and no longer inside the `uPred` module.
+* Remove the `gen_heap` notations `l ↦ -` and `l ↦{q} -`. They were barely used
+  and looked very confusing in context: `l ↦ - ∗ P` looks like a magic wand.
+* Change `gen_inv_heap` notation `l ↦□ I` to `l ↦_I □`, so that `↦□` can be used
+  by `gen_heap`.
+* Strengthen `mapsto_valid_2` conclusion from `✓ (q1 + q2)%Qp` to
+  `⌜✓ (q1 + q2)%Qp ∧ v1 = v2⌝`.
+* Change `gen_heap_init` to also return ownership of the points-to facts for the
+  initial heap.
+* Rename `mapsto_mapsto_ne` to `mapsto_frac_ne`, and add a simpler
+  `mapsto_ne` that does not require reasoning about fractions.
+* Deprecate the `auth` and `sts` modules. These were logic-level wrappers around
+  the underlying RAs; as far as we know, they are unused since they were not
+  flexible enough for practical use.
+* Deprecate the `viewshift` module, which defined a binary view-shift connective
+  with an implicit persistence modality. It was unused and too easily confused
+  with `={_}=∗`, the binary view-shift (fancy update) *without* a persistence
+  modality.
+
+**Changes in `program_logic`:**
+
+* `wp_strong_adequacy` now applies to an initial state with multiple
+  threads instead of only a single thread. The derived adequacy lemmas
+  are unchanged.
+* `pure_exec_fill` is no longer registered as an instance for `PureExec`, to
+  avoid TC search attempting to apply this instance all the time.
+* Merge `wp_value_inv`/`wp_value_inv'` into `wp_value_fupd`/`wp_value_fupd'` by
+  making the lemmas bidirectional.
+* Generalize HeapLang's `mapsto` (`↦`), `array` (`↦∗`), and atomic heap
+  connectives to discardable fractions. See the CHANGELOG entry in the category
+  `base_logic` for more information.
+* Opening an invariant or eliminating a mask-changing update modality around a
+  non-atomic weakest precondition creates a side-condition `Atomic ...`.
+  Before, this would fail with the unspecific error "iMod: cannot eliminate
+  modality (|={E1,E2}=> ...) in (WP ...)".
+* In `Ectx_step` and `step_atomic`, mark the parameters that are determined by
+  the goal as implicit.
+* Deprecate the `hoare` module to prevent accidental usage; the recommended way
+  to write Hoare-style specifications is to use Texan triples.
+
+**Changes in `heap_lang`:**
+
+* `wp_pures` now turns goals of the form `WP v {{ Φ }}` into `Φ v`.
+* Fix `wp_bind` in case of a NOP (i.e., when the given expression pattern is
+  already at the top level).
+* The `wp_` tactics now preserve the possibility of doing a fancy update when
+  the expression reduces to a value.
+* Move `IntoVal`, `AsVal`, `Atomic`, `AsRecV`, and `PureExec` instances to their
+  own file [heap_lang.class_instances](iris_heap_lang/class_instances.v).
+* Move `inv_head_step` tactic and `head_step` auto hints (now part of new hint
+  database `head_step`) to [heap_lang.tactics](iris_heap_lang/tactics.v).
+* The tactic `wp_apply` no longer performs `wp_pures` before applying the given
+  lemma. The new tactic `wp_smart_apply` repeatedly performs single `wp_pure`
+  steps until the lemma matches the goal.
+
+The following `sed` script helps adjust your code to the renaming (on macOS,
+replace `sed` by `gsed`, installed via e.g. `brew install gnu-sed`).
+Note that the script is not idempotent, do not run it twice.
+```
+sed -i -E -f- $(find theories -name "*.v") <<EOF
+# agree and L suffix renames
+s/\bagree_op_inv'/to_agree_op_inv/g
+s/\bagree_op_invL'/to_agree_op_inv_L/g
+s/\bauth_auth_frac_op_invL\b/auth_auth_frac_op_inv_L/g
+s/\b(excl|frac|ufrac)_auth_agreeL/\1_auth_agree_L/g
+# auth_both_valid
+s/\bauth_both_valid\b/auth_both_valid_discrete/g
+s/\bauth_both_frac_valid\b/auth_both_frac_valid_discrete/g
+# gen_heap_ctx and proph_map_ctx
+s/\bgen_heap_ctx\b/gen_heap_interp/g
+s/\bproph_map_ctx\b/proph_map_interp/g
+# other gen_heap changes
+s/\bmapsto_mapsto_ne\b/mapsto_frac_ne/g
+# remove Ts in algebra
+s/\bofeT\b/ofe/g
+s/\bOfeT\b/Ofe/g
+s/\bcmraT\b/cmra/g
+s/\bCmraT\b/Cmra/g
+s/\bucmraT\b/ucmra/g
+s/\bUcmraT\b/Ucmra/g
+# _op/valid/core lemmas
+s/\b(u?frac_(op|valid))'/\1/g
+s/\b((coPset|gset)_op)_union\b/\1/g
+s/\b((coPset|gset)_core)_self\b/\1/g
+s/\b(gmultiset_op)_disj_union\b/\1/g
+s/\b(gmultiset_core)_empty\b/\1/g
+s/\b(nat_op)_plus\b/\1/g
+s/\b(max_nat_op)_max\b/\1/g
+# equiv_spec
+s/\bequiv_entails\b/equiv_entails_1_1/g
+s/\bequiv_entails_sym\b/equiv_entails_1_2/g
+s/\bequiv_spec\b/equiv_entails/g
+EOF
+```
+
+## Iris 3.3.0 (released 2020-07-15)
+
+This release does not have any outstanding highlights, but contains a large
+number of improvements all over the board.  For instance:
+
+* `heap_lang` now supports deallocation as well as better reasoning about
+  "invariant locations" (locations that perpetually satisfy some Coq-level
+  invariant).
+* Invariants (`inv N P`) are more flexible, now also supporting splitting
+  and merging of invariants with respect to separating conjunction.
+* Performance of the proofmode for BIs constructed on top of other BIs (e.g.,
+  `monPred`) was greatly improved, leading to up to 70% speedup in individual
+  files. As part of this refactoring, the proofmode can now also be instantiated
+  with entirely "logical" notion of BIs that do not have a (non-trivial) metric
+  structure, and still support reasoning about ▷.
+* The proof mode now provides experimental support for naming pure facts in
+  intro patterns.  See
+  [iris/string-ident](https://gitlab.mpi-sws.org/iris/string-ident) for details.
+* Iris now provides official ASCII notation. We still recommend using the
+  Unicode notation for better consistency and interoperability with other Iris
+  libraries, but provide ASCII notation for when Unicode is not an option.
+* We removed several coercions, fixing "ambiguous coercion path" warnings and
+  solving some readability issues.
+* Coq 8.10, 8.11, and 8.12 are newly supported by this release, and Coq 8.7 and
+  8.8 are no longer supported.
+
+Further details are given in the changelog below. We always first list the
+potentially breaking changes, then (some of) the additions.
+
+This release of Iris received contributions by Abel Nieto, Amin Timany, Dan
+Frumin, Derek Dreyer, Dmitry Khalanskiy, Gregory Malecha, Jacques-Henri Jourdan,
+Jonas Kastberg, Jules Jacobs, Matthieu Sozeau, Maxime Dénès, Michael Sammler,
+Paolo G. Giarrusso, Ralf Jung, Robbert Krebbers, Simon Friis Vindum, Simon
+Spies, and Tej Chajed.  Thanks a lot to everyone involved!
+
+**Changes in `heap_lang`:**
+
+* Remove global `Open Scope Z_scope` from `heap_lang.lang`, and leave it up to
+  reverse dependencies if they want to `Open Scope Z_scope` or not.
+* Fix all binary operators performing pointer arithmetic (instead of just the
+  dedicated `OffsetOp` operator doing that).
+* Rename `heap_lang.lifting` to `heap_lang.primitive_laws`. There now also
+  exists `heap_lang.derived_laws`.
+* Make lemma names for `fill` more consistent
+  - Use the `_inv` suffix for the the backwards directions:
+   `reducible_fill` → `reducible_fill_inv`,
+   `reducible_no_obs_fill` → `reducible_no_obs_fill_inv`,
+   `not_stuck_fill` → `not_stuck_fill_inv`.
+  - Use the non-`_inv` names (that freed up) for the forwards directions:
+   `reducible_fill`, `reducible_no_obs_fill`, `irreducible_fill_inv`.
+* Remove namespace `N` from `is_lock`.
+
+* Add support for deallocation of locations via the `Free` operation.
+* Add a fraction to the heap_lang `array` assertion.
+* Add `lib.array` module for deallocating, copying and cloning arrays.
+* Add TWP (total weakest-pre) lemmas for arrays.
+* Add a library for "invariant locations": heap locations that will not be
+  deallocated (i.e., they are GC-managed) and satisfy some pure, Coq-level
+  invariant.  See `iris.base_logic.lib.gen_inv_heap` for details.
+* Add the ghost state for "invariant locations" to `heapG`.  This affects the
+  statement of `heap_adequacy`, which is now responsible for initializing the
+  "invariant locations" invariant.
+* Add lemma `mapsto_mapsto_ne : ¬ ✓(q1 + q2)%Qp → l1 ↦{q1} v1 -∗ l2 ↦{q2} v2 -∗ ⌜l1 ≠ l2⌝`.
+* Add lemma `is_lock_iff` and show that `is_lock` is contractive.
+
+**Changes in `program_logic`:**
+
+* In the axiomatization of ectx languages, replace the axiom of positivity of
+  context composition with an axiom that says if `fill K e` takes a head step,
+  then either `K` is the empty evaluation context or `e` is a value.
+
+**Changes in the logic (`base_logic`, `bi`):**
+
+* Rename some accessor-style lemmas to consistently use the suffix `_acc`
+  instead of `_open`:
+  `inv_open` → `inv_acc`, `inv_open_strong` → `inv_acc_strong`,
+  `inv_open_timeless` → `inv_acc_timeless`, `na_inv_open` → `na_inv_acc`,
+  `cinv_open` → `cinv_acc`, `cinv_open_strong` → `cinv_acc_strong`,
+  `auth_open` → `auth_acc`, `sts_open` → `sts_acc`.
+  To make this work, also rename `inv_acc` → `inv_alter`.
+  (Most developments should be unaffected as the typical way to invoke these
+  lemmas is through `iInv`, and that does not change.)
+* Change `inv_iff`, `cinv_iff` and `na_inv_iff` to make order of arguments
+  consistent and more convenient for `iApply`. They are now of the form
+  `inv N P -∗ ▷ □ (P ↔ Q) -∗ inv N Q` and (similar for `na_inv_iff` and
+  `cinv_iff`), following e.g., `inv_alter` and `wp_wand`.
+* Rename `inv_sep_1` → `inv_split_1`, `inv_sep_2` → `inv_split_2`, and
+  `inv_sep` → `inv_split` to be consistent with the naming convention in boxes.
+* Update the strong variant of the accessor lemma for cancellable invariants to
+  match that of regular invariants, where you can pick the mask at a later time.
+  (The other part that makes it strong is that you get back the token for the
+  invariant immediately, not just when the invariant is closed again.)
+* Rename `iProp`/`iPreProp` to `iPropO`/`iPrePropO` since they are `ofeT`s.
+  Introduce `iProp` for the `Type` carrier of `iPropO`.
+* Flatten the BI hierarchy by merging the `bi` and `sbi` canonical structures.
+  This gives significant performance benefits on developments that construct BIs
+  from BIs (e.g., use `monPred`). For, example it gives a performance gain of 37%
+  overall on lambdarust-weak, with improvements for individual files up to 72%,
+  see Iris issue #303. The concrete changes are as follows:
+  + The `sbi` canonical structure has been removed.
+  + The `bi` canonical structure contains the later modality. It does not
+    require the later modality to be contractive or to satisfy the Löb rule, so
+    we provide a smart constructor `bi_later_mixin_id` to get the later axioms
+    "for free" if later is defined to be the identity function.
+  + There is a separate class `BiLöb`, and a "free" instance of that class if
+    the later modality is contractive. A `BiLöb` instance is required for the
+    `iLöb` tactic, and for timeless instances of implication and wand.
+  + There is a separate type class `BiInternalEq` for BIs with a notion of
+    internal equality (internal equality was part of `sbi`). An instance of this
+    class is needed for the `iRewrite` tactic, and the various lemmas about
+    internal equality.
+  + The class `SbiEmbed` has been removed and been replaced by classes
+    `BiEmbedLater` and `BiEmbedInternalEq`.
+  + The class `BiPlainly` has been generalized to BIs without internal equality.
+    As a consequence, there is a separate class `BiPropExt` for BIs with
+    propositional extensionality (i.e., `■ (P ∗-∗ Q) ⊢ P ≡ Q`).
+  + The class `BiEmbedPlainly` is a bi-entailment (i.e., `⎡■ P⎤ ⊣⊢ ■ ⎡P⎤`
+    instead of `■ ⎡P⎤ ⊢ ⎡■ P⎤`) as it has been generalized to BIs without a
+    internal equality. In the past, the left-to-right direction was obtained for
+    "free" using the rules of internal equality.
+* Remove coercion from `iProp` (and other MoSeL propositions) to `Prop`.
+  Instead, use the new unary notation `⊢ P`, or `⊢@{PROP} P` if the proposition
+  type cannot be inferred. This also means that `%I` should not be necessary any
+  more when stating lemmas, as `P` above is automatically parsed in scope `%I`.
+* Some improvements to the `bi/lib/core` construction:
+  + Rename `coreP_wand` into `coreP_entails` since it does not involve wands.
+  + Generalize `coreP_entails` to non-affine BIs, and prove more convenient
+    version `coreP_entails'` for `coreP P` with `P` affine.
+  + Add instance `coreP_affine P : Affine P → Affine (coreP P)` and
+    lemma `coreP_wand P Q : <affine> ■ (P -∗ Q) -∗ coreP P -∗ coreP Q`.
+* Remove notation for 3-mask step-taking updates, and made 2-mask notation less
+  confusing by distinguishing it better from mask-changing updates.
+  Old: `|={Eo,Ei}▷=> P`. New: `|={Eo}[Ei]▷=> P`.
+  Here, `Eo` is the "outer mask" (used at the beginning and end) and `Ei` the
+  "inner mask" (used around the ▷ in the middle).
+  As part of this, the lemmas about the 3-mask variant were changed to be about
+  the 2-mask variant instead, and `step_fupd_mask_mono` now also has a more
+  consistent argument order for its masks.
+
+* Add a counterexample showing that sufficiently powerful cancellable invariants
+  with a linear token subvert the linearity guarantee (see
+  `bi.lib.counterexmples` for details).
+* Redefine invariants as "semantic invariants" so that they support
+  splitting and other forms of weakening.
+* Add lemmas `inv_combine` and `inv_combine_dup_l` for combining invariants.
+* Add the type `siProp` of "plain" step-indexed propositions, together with
+  basic proofmode support.
+* New ASCII versions of Iris notations. These are marked parsing only and
+  can be made available using `Require Import iris.bi.ascii`. The new
+  notations are (notations marked [†] are disambiguated using notation scopes):
+  - entailment: `|-` for `⊢` and `-|-` for `⊣⊢`
+  - logic[†]: `->` for `→`, `/\\` for `∧`, `\\/` for `∨`, and `<->` for `↔`
+  - quantifiers[†]: `forall` for `∀` and `exists` for `∃`
+  - separation logic: `**` for `∗`, `-*` for `-∗`, and `*-*` for `∗-∗`
+  - step indexing: `|>` for `▷`
+  - modalities: `<#>` for `□` and `<except_0>` for `◇`
+  - most derived notations can be computed from previous notations using the
+    substitutions above, e.g. replace `∗` with `*` and `▷` with `|>`. Examples
+    include the following:
+    - `|={E1,E2}=* P` for `|={E1,E2}=∗`
+    - `P ={E}=* Q` for `P ={E}=∗ Q`
+    - `P ={E1,E2}=* Q` for `P ={E1,E2}=∗ Q`
+    - `|={E1}[E2]|>=> Q` for `|={E1}[E2]▷=> Q`
+    The full list can be found in [theories/bi/ascii.v](theories/bi/ascii.v),
+    where the ASCII notations are defined in terms of the unicode notations.
+* Add affine, absorbing, persistent and timeless instances for telescopes.
+* Add a construction `bi_rtc` to create reflexive transitive closures of
+  PROP-level binary relations.
+* Slightly strengthen the lemmas `big_sepL_nil'`, `big_sepL2_nil'`,
+  `big_sepM_nil'` `big_sepM2_empty'`, `big_sepS_empty'`, and `big_sepMS_empty'`.
+  They now only require that the argument `P` is affine instead of the whole BI
+  being affine.
+* Add `big_sepL_insert_acc`, a variant of `big_sepL_lookup_acc` which allows
+  updating the value.
+* Add many missing `Proper`/non-expansiveness lemmas for big-ops.
+* Add `big_*_insert_delete` lemmas to split a `<[i:=x]> m` map into `i` and the rest.
+* Seal the definitions of `big_opS`, `big_opMS`, `big_opM` and `big_sepM2`
+  to prevent undesired simplification.
+* Fix `big_sepM2_fmap*` only working for `nat` keys.
+
+**Changes in `proofmode`:**
+
+* Make use of `notypeclasses refine` in the implementation of `iPoseProof` and
+  `iAssumption`, see <https://gitlab.mpi-sws.org/iris/iris/merge_requests/329>.
+  This has two consequences:
+  1. Coq's "new" unification algorithm (the one in `refine`, not the "old" one
+     in `apply`) is used more often by the proof mode tactics.
+  2. Due to the use of `notypeclasses refine`, TC constraints are solved less
+     eagerly, see <https://github.com/coq/coq/issues/6583>.
+  In order to port your development, it is often needed to instantiate evars
+  explicitly (since TC search is performed less eagerly), and in few cases it is
+  needed to unfold definitions explicitly (due to new unification algorithm
+  behaving differently).
+* Strengthen the tactics `iDestruct`, `iPoseProof`, and `iAssert`:
+  - They succeed in certain cases where they used to fail.
+  - They keep certain hypotheses in the intuitionistic context, where they were
+    moved to the spatial context before.
+  The latter can lead to stronger proof mode contexts, and therefore to
+  backwards incompatibility. This can usually be fixed by manually clearing some
+  hypotheses. A more detailed description of the changes can be found in
+  <https://gitlab.mpi-sws.org/iris/iris/merge_requests/341>.
+* Remove the long-deprecated `cofeT` alias (for `ofeT`) and `dec_agree` RA (use
+  `agree` instead).
+
+* Add `auto` hint for `∗-∗`.
+* Add new tactic `iStopProof` to turn the proof mode entailment into an ordinary
+  Coq goal `big star of context ⊢ proof mode goal`.
+* Add new introduction pattern `-# pat` that moves a hypothesis from the
+  intuitionistic context to the spatial context.
+* The tactic `iAssumption` also recognizes assumptions `⊢ P` in the Coq context.
+* Better support for telescopes in the proof mode, i.e., all tactics should
+  recognize and distribute telescopes now.
+* The proof mode now supports names for pure facts in intro patterns. Support
+  requires implementing `string_to_ident`. Without this tactic such patterns
+  will fail. We provide one implementation using Ltac2 which works with Coq 8.11
+  and can be installed with opam; see
+  [iris/string-ident](https://gitlab.mpi-sws.org/iris/string-ident) for details.
+
+**Changes in `algebra`:**
+
+* Remove `Core` type class for defining the total core; it is now always
+  defined in terms of the partial core. The only user of this type class was the
+  STS RA.
+* The functions `{o,r,ur}Functor_diag` are no longer coercions, and renamed into
+  `{o,r,ur}Functor_apply` to better match their intent. This fixes "ambiguous
+  coercion path" warnings.
+* Rename `{o,r,ur}Functor_{ne,id,compose,contractive}` into
+  `{o,r,ur}Functor_map_{ne,id,compose,contractive}`.
+* Move derived camera constructions (`frac_auth` and `ufrac_auth`) to the folder
+  `algebra/lib`.
+* Rename `mnat` to `max_nat` and "box" it by creating a separate type for it.
+* Move the RAs for `nat` and `positive` and the `mnat` RA into a separate
+  module. They must now be imported from `From iris.algebra Require Import
+  numbers`.
+* Make names of `f_op`/`f_core` rewrite lemmas more consistent by always making
+  `_core`/`_op` the suffix:
+  `op_singleton` → `singleton_op`, `core_singleton` → `singleton_core`,
+  `discrete_fun_op_singleton` → `discrete_fun_singleton_op`,
+  `discrete_fun_core_singleton` → `discrete_fun_singleton_core`,
+  `list_core_singletonM` → `list_singleton_core`,
+  `list_op_singletonM` → `list_singleton_op`,
+  `sts_op_auth_frag` → `sts_auth_frag_op`,
+  `sts_op_auth_frag_up` → `sts_auth_frag_up_op`,
+  `sts_op_frag` → `sts_frag_op`,
+  `list_op_length` → `list_length_op`,
+  `list_core_singletonM` → `list_singletonM_core`,
+  `list_op_singletonM` → `list_singletonM_op`.
+* All list "map singleton" lemmas consistently use `singletonM` in their name:
+  `list_singleton_valid` → `list_singletonM_valid`,
+  `list_singleton_core_id` → `list_singletonM_core_id`,
+  `list_singleton_snoc` → `list_singletonM_snoc`,
+  `list_singleton_updateP` → `list_singletonM_updateP`,
+  `list_singleton_updateP'` → `list_singletonM_updateP'`,
+  `list_singleton_update` → `list_singletonM_update`,
+  `list_alloc_singleton_local_update` → `list_alloc_singletonM_local_update`.
+* Remove `auth_both_op` and rename `auth_both_frac_op` into `auth_both_op`.
+* Add lemma `singleton_included : {[ i := x ]} ≼ ({[ i := y ]} ↔ x ≡ y ∨ x ≼ y`,
+  and rename existing asymmetric lemmas (with a singleton on just the LHS):
+  `singleton_includedN` → `singleton_includedN_l`,
+  `singleton_included` → `singleton_included_l`,
+  `singleton_included_exclusive` → `singleton_included_exclusive_l`.
+
+* Add notion `ofe_iso A B` that states that OFEs `A` and `B` are
+  isomorphic. This is used in the COFE solver.
+* Add `{o,r,ur}Functor_oFunctor_compose` for composition of functors.
+* Add `pair_op_1` and `pair_op_2` to split a pair where one component is the unit.
+* Add derived camera construction `excl_auth A` for `auth (option (excl A))`.
+* Make lemma `Excl_included` a bi-implication.
+* Make `auth_update_core_id` work with any fraction of the authoritative
+  element.
+* Add `min_nat`, an RA for natural numbers with `min` as the operation.
+* Add many missing `Proper`/non-expansiveness lemmas for maps and lists.
+* Add `list_singletonM_included` and `list_lookup_singletonM_{lt,gt}` lemmas
+  about singletons in the list RA.
+* Add `list_core_id'`, a stronger version of `list_core_id` which only talks
+  about elements that are actually in the list.
+
+The following `sed` script helps adjust your code to the renaming (on macOS,
+replace `sed` by `gsed`, installed via e.g. `brew install gnu-sed`).
+Note that the script is not idempotent, do not run it twice.
+```
+sed -i -E '
+# functor renames
+s/\b(o|r|ur)Functor_(ne|id|compose|contractive)\b/\1Functor_map_\2/g
+# singleton_included renames
+s/\bsingleton_includedN\b/singleton_includedN_l/g
+s/\bsingleton_included\b/singleton_included_l/g
+s/\bsingleton_included_exclusive\b/singleton_included_exclusive_l/g
+# f_op/f_core renames
+s/\b(op|core)_singleton\b/singleton_\1/g
+s/\bdiscrete_fun_(op|core)_singleton\b/discrete_fun_singleton_\1/g
+s/\bsts_op_(auth_frag|auth_frag_up|frag)\b/sts_\1_op/g
+s/\blist_(op|core)_singletonM\b/list_singletonM_\1/g
+s/\blist_op_length\b/list_length_op/g
+# list "singleton map" renames
+s/\blist_singleton_valid\b/list_singletonM_valid/g
+s/\blist_singleton_core_id\b/list_singletonM_core_id/g
+s/\blist_singleton_snoc\b/list_singletonM_snoc/g
+s/\blist_singleton_updateP\b/list_singletonM_updateP/g
+s/\blist_singleton_update\b/list_singletonM_update/g
+s/\blist_alloc_singleton_local_update\b/list_alloc_singletonM_local_update/g
+# inv renames
+s/\binv_sep(|_1|_2)\b/inv_split\1/g
+s/\binv_acc\b/inv_alter/g
+s/\binv_open(|_strong|_timeless)\b/inv_acc\1/g
+s/\bcinv_open(|_strong)\b/cinv_acc\1/g
+s/\b(na_inv|auth|sts)_open\b/\1_acc/g
+# miscellaneous
+s/\bauth_both_frac_op\b/auth_both_op/g
+s/\bmnat\b/max_nat/g
+s/\bcoreP_wand\b/coreP_entails/g
+' $(find theories -name "*.v")
+```
+
+## Iris 3.2.0 (released 2019-08-29)
+
+The highlight of this release is the completely re-engineered interactive proof
+mode.  Not only did many tactics become more powerful; the entire proof mode can
+now be used not just for Iris but also for other separation logics satisfying
+the proof mode interface (e.g., [Iron] and [GPFSL]). Also see the
+[accompanying paper][MoSeL].
+
+[Iron]: https://iris-project.org/iron/
+[GPFSL]: https://gitlab.mpi-sws.org/iris/gpfsl/
+[MoSeL]: https://iris-project.org/mosel/
+
+Beyond that, the Iris program logic gained the ability to reason about
+potentially stuck programs, and a significantly strengthened adequacy theorem
+that unifies the three previously separately presented theorems.  There are now
+also Hoare triples for total program correctness (but with very limited support
+for invariants) and logical atomicity.
+
+And finally, our example language HeapLang was made more realistic
+(Compare-and-set got replaced by compare-exchange and limited to only compare
+values that can actually be compared atomically) and more powerful, with added
+support for arrays and prophecy variables.
+
+Further details are given in the changelog below.
+
+This release of Iris received contributions by Aleš Bizjak, Amin Timany, Dan
+Frumin, Glen Mével, Hai Dang, Hugo Herbelin, Jacques-Henri Jourdan, Jan Menz,
+Jan-Oliver Kaiser, Jonas Kastberg Hinrichsen, Joseph Tassarotti, Mackie Loeffel,
+Marianna Rapoport, Maxime Dénès, Michael Sammler, Paolo G. Giarrusso,
+Pierre-Marie Pédrot, Ralf Jung, Robbert Krebbers, Rodolphe Lepigre, and Tej
+Chajed. Thanks a lot to everyone involved!
+
+**Changes in the theory of Iris itself:**
+
+* Change in the definition of WP, so that there is a fancy update between
+  the quantification over the next states and the later modality. This makes it
+  possible to prove more powerful lifting lemmas: The new versions feature an
+  "update that takes a step".
+* Add weakest preconditions for total program correctness.
+* "(Potentially) stuck" weakest preconditions and the "plainly modality" are no
+  longer considered experimental.
+* Add the notion of an "observation" to the language interface, so that
+  every reduction step can optionally be marked with an event, and an execution
+  trace has a matching list of events.  Change WP so that it is told the entire
+  future trace of observations from the beginning.
+* The Löb rule is now a derived rule; it follows from later-intro, later
+  being contractive and the fact that we can take fixpoints of contractive
+  functions.
+* Add atomic updates and logically atomic triples, including tactic support.
+  See `heap_lang/lib/increment.v` for an example.
+* Extend the state interpretation with a natural number that keeps track of
+  the number of forked-off threads, and have a global fixed proposition that
+  describes the postcondition of each forked-off thread (instead of it being
+  `True`).
+* A stronger adequacy statement for weakest preconditions that involves
+  the final state, the post-condition of forked-off threads, and also applies if
+  the main-thread has not terminated.
+* The user-chosen functor used to instantiate the Iris logic now goes from
+  COFEs to Cameras (it was OFEs to Cameras).
+
+**Changes in heap_lang:**
+
+* CAS (compare-and-set) got replaced by CmpXchg (compare-exchange).  The
+  difference is that CmpXchg returns a pair consisting of the old value and a
+  boolean indicating whether the comparison was successful and hence the
+  exchange happened.  CAS can be obtained by simply projecting to the second
+  component, but also providing the old value more closely models the primitive
+  typically provided in systems languages (C, C++, Rust).
+  The comparison by this operation also got weakened to be efficiently
+  implementable: CmpXchg may only be used to compare "unboxed" values that can
+  be represented in a single machine word. It is sufficient if one of the two
+  compared values is unboxed.
+* For consistency, the restrictions CmpXchg imposes on comparison also apply to
+  the `=` binary operator. This also fixes the long-standing problem that that
+  operator allowed compared closures with each other.
+* Implement prophecy variables using the new support for "observations". The
+  erasure theorem (showing that prophecy variables do not alter program
+  behavior) can be found [in the iris/examples repository][prophecy-erasure].
+* heap_lang now uses right-to-left evaluation order. This makes it
+  significantly easier to write specifications of curried functions.
+* heap_lang values are now injected in heap_lang expressions via a specific
+  constructor of the expr inductive type. This simplifies much the tactical
+  infrastructure around the language. In particular, this allow us to get rid
+  the reflection mechanism that was needed for proving closedness, atomicity and
+  "valueness" of a term. The price to pay is the addition of new
+  "administrative" reductions in the operational semantics of the language.
+* heap_lang now has support for allocating, accessing and reasoning about arrays
+  (continuously allocated regions of memory).
+* One can now assign "meta" data to heap_lang locations.
+
+[prophecy-erasure]: https://gitlab.mpi-sws.org/iris/examples/blob/3f33781fe6e19cfdb25259c8194d34403f1134d5/theories/logatom/proph_erasure.v
+
+**Changes in Coq:**
+
+* An all-new generalized proof mode that abstracts away from Iris!  Major new
+  features:
+  - The proof mode can now be used with logics derived from Iris (like iGPS),
+    with non-step-indexed logics and even with non-affine (i.e., linear) logics.
+  - `iModIntro` is more flexible and more powerful, it now also subsumes
+    `iNext` and `iAlways`.
+  - General infrastructure for deriving a logic for monotone predicates over
+    an existing logic (see the paper for more details).
+    Developments instantiating the proof mode typeclasses may need significant
+    changes.  For developments just using the proof mode tactics, porting should
+    not be too much effort.  Notable things to port are:
+  - All the BI laws moved from the `uPred` module to the `bi` module.  For
+    example, `uPred.later_equivI` became `bi.later_equivI`.
+  - Big-ops are automatically imported, imports of `iris.base_logic.big_op` have
+    to be removed.
+  - The ⊢ notation can sometimes infer different (but convertible) terms when
+    searching for the BI to use, which (due to Coq limitations) can lead to
+    failing rewrites, in particular when rewriting at function types.
+* The `iInv` tactic can now be used without the second argument (the name for
+  the closing update).  It will then instead add the obligation to close the
+  invariant to the goal.
+* The new `iEval` tactic can be used to execute a simplification or rewriting
+  tactic on some specific part(s) of the proofmode goal.
+* Added support for defining derived connectives involving n-ary binders using
+  telescopes.
+* The proof mode now more consistently "prettifies" the goal after each tactic.
+  Prettification also simplifies some BI connectives, like conditional
+  modalities and telescope quantifiers.
+* Improved pretty-printing of Iris connectives (in particular WP and fancy
+  updates) when Coq has to line-wrap the output.  This goes hand-in-hand with an
+  improved test suite that also tests pretty-printing.
+* Added a `gmultiset` RA.
+* Rename `timelessP` → `timeless` (projection of the `Timeless` class)
+* The CMRA axiom `cmra_extend` is now stated in `Type`, using `sigT` instead of
+  in `Prop` using `exists`. This makes it possible to define the function space
+  CMRA even for an infinite domain.
+* Rename proof mode type classes for laters:
+  - `IntoLaterN` → `MaybeIntoLaterN` (this one _may_ strip a later)
+  - `IntoLaterN'` → `IntoLaterN` (this one _should_ strip a later)
+  - `IntoLaterNEnv` → `MaybeIntoLaterNEnv`
+  - `IntoLaterNEnvs` → `MaybeIntoLaterNEnvs`
+* Rename:
+  - `frag_auth_op` → `frac_auth_frag_op`
+  - `cmra_opM_assoc` → `cmra_op_opM_assoc`
+  - `cmra_opM_assoc_L` → `cmra_op_opM_assoc_L`
+  - `cmra_opM_assoc'` → `cmra_opM_opM_assoc`
+* `namespaces` has been moved to std++.
+* Changed `IntoVal` to be directly usable for rewriting `e` into `of_val v`, and
+  changed `AsVal` to be usable for rewriting via the `[v <-]` destruct pattern.
+* `wp_fork` is now written in curried form.
+* `PureExec`/`wp_pure` now supports taking multiple steps at once.
+* A new tactic, `wp_pures`, executes as many pure steps as possible, excluding
+  steps that would require unlocking subterms. Every impure wp_ tactic executes
+  this tactic before doing anything else.
+* Add `big_sepM_insert_acc`.
+* Add big separating conjunctions that operate on pairs of lists (`big_sepL2`)
+  and on pairs of maps (`big_sepM2`). In the former case the lists are required
+  to have the same length, and in the latter case the maps are required to
+  have the same domains.
+* The `_strong` lemmas (e.g. `own_alloc_strong`) work for all infinite
+  sets, instead of just for cofinite sets. The versions with cofinite
+  sets have been renamed to use the `_cofinite` suffix.
+* Remove locked value lambdas. The value scope notations `rec: f x := e` and
+  `(λ: x, e)` no longer add a `locked`. Instead, we made the `wp_` tactics
+  smarter to no longer unfold lambdas/recs that occur behind definitions.
+* Export the fact that `iPreProp` is a COFE.
+* The CMRA `auth` now can have fractional authoritative parts. So now `auth` has
+  3 types of elements: the fractional authoritative `●{q} a`, the full
+  authoritative `● a ≡ ●{1} a`, and the non-authoritative `◯ a`. Updates are
+  only possible with the full authoritative element `● a`, while fractional
+  authoritative elements have agreement: `✓ (●{p} a ⋅ ●{q} b) ⇒ a ≡ b`. As a
+  consequence, `auth` is no longer a COFE and does not preserve Leibniz
+  equality.
+* Add a COFE construction (and functor) on dependent pairs `sigTO`, dual to
+  `discrete_funO`.
+* Rename in `auth`:
+  - Use `auth_auth_proj`/`auth_frag_proj` for the projections of `auth`:
+    `authoritative` → `auth_auth_proj` and `auth_own` → `auth_frag_proj`.
+  - Use `auth_auth` and `auth_frag` for the injections into authoritative
+    elements and non-authoritative elements respectively.
+  - Lemmas for the projections and injections are renamed accordingly.
+    For examples:
+    + `authoritative_validN` → `auth_auth_proj_validN`
+    + `auth_own_validN` → `auth_frag_proj_validN`
+    + `auth_auth_valid` was not renamed because it was already used for the
+      authoritative injection.
+  - `auth_both_valid` → `auth_both_valid_2`
+  - `auth_valid_discrete_2` → `auth_both_valid`
+* Add the camera `ufrac` for unbounded fractions (i.e. without fractions that
+  can be `> 1`) and the camera `ufrac_auth` for a variant of the authoritative
+  fractional camera (`frac_auth`) with unbounded fractions.
+* Changed `frac_auth` notation from `●!`/`◯!` to `●F`/`◯F`. sed script:
+  `s/◯!/◯F/g; s/●!/●F/g;`.
+* Lemma `prop_ext` works in both directions; its default direction is the
+  opposite of what it used to be.
+* Make direction of `f_op` rewrite lemmas more consistent: Flip `pair_op`,
+  `Cinl_op`, `Cinr_op`, `cmra_morphism_op`, `cmra_morphism_pcore`,
+  `cmra_morphism_core`.
+* Rename lemmas `fupd_big_sep{L,M,S,MS}` into `big_sep{L,M,S,MS}_fupd` to be
+  consistent with other such big op lemmas. Also add such lemmas for `bupd`.
+* Rename `C` suffixes into `O` since we no longer use COFEs but OFEs. Also
+  rename `ofe_fun` into `discrete_fun` and the corresponding notation `-c>` into
+  `-d>`. The renaming can be automatically done using the following script
+  (on macOS, replace `sed` by `gsed`, installed via e.g. `brew install gnu-sed`):
+```
+sed -i '
+s/\bCofeMor/OfeMor/g;
+s/\-c>/\-d>/g;
+s/\bcFunctor/oFunctor/g;
+s/\bCFunctor/OFunctor/g;
+s/\b\%CF/\%OF/g;
+s/\bconstCF/constOF/g;
+s/\bidCF/idOF/g
+s/\bdiscreteC/discreteO/g;
+s/\bleibnizC/leibnizO/g;
+s/\bunitC/unitO/g;
+s/\bprodC/prodO/g;
+s/\bsumC/sumO/g;
+s/\bboolC/boolO/g;
+s/\bnatC/natO/g;
+s/\bpositiveC/positiveO/g;
+s/\bNC/NO/g;
+s/\bZC/ZO/g;
+s/\boptionC/optionO/g;
+s/\blaterC/laterO/g;
+s/\bofe\_fun/discrete\_fun/g;
+s/\bdiscrete\_funC/discrete\_funO/g;
+s/\bofe\_morC/ofe\_morO/g;
+s/\bsigC/sigO/g;
+s/\buPredC/uPredO/g;
+s/\bcsumC/csumO/g;
+s/\bagreeC/agreeO/g;
+s/\bauthC/authO/g;
+s/\bnamespace_mapC/namespace\_mapO/g;
+s/\bcmra\_ofeC/cmra\_ofeO/g;
+s/\bucmra\_ofeC/ucmra\_ofeO/g;
+s/\bexclC/exclO/g;
+s/\bgmapC/gmapO/g;
+s/\blistC/listO/g;
+s/\bvecC/vecO/g;
+s/\bgsetC/gsetO/g;
+s/\bgset\_disjC/gset\_disjO/g;
+s/\bcoPsetC/coPsetO/g;
+s/\bgmultisetC/gmultisetO/g;
+s/\bufracC/ufracO/g
+s/\bfracC/fracO/g;
+s/\bvalidityC/validityO/g;
+s/\bbi\_ofeC/bi\_ofeO/g;
+s/\bsbi\_ofeC/sbi\_ofeO/g;
+s/\bmonPredC/monPredO/g;
+s/\bstateC/stateO/g;
+s/\bvalC/valO/g;
+s/\bexprC/exprO/g;
+s/\blocC/locO/g;
+s/\bdec\_agreeC/dec\_agreeO/g;
+s/\bgnameC/gnameO/g;
+s/\bcoPset\_disjC/coPset\_disjO/g;
+' $(find theories -name "*.v")
+```
+
+## Iris 3.1.0 (released 2017-12-19)
+
+**Changes in and extensions of the theory:**
+
+* Define `uPred` as a quotient on monotone predicates `M -> SProp`.
+* Get rid of some primitive laws; they can be derived:
+  `True ⊢ □ True` and `□ (P ∧ Q) ⊢ □ (P ∗ Q)`
+* Camera morphisms have to be homomorphisms, not just monotone functions.
+* Add a proof that `f` has a fixed point if `f^k` is contractive.
+* Constructions for least and greatest fixed points over monotone predicates
+  (defined in the logic of Iris using impredicative quantification).
+* Add a proof of the inverse of `wp_bind`.
+* [Experimental feature] Add new modality: ■ ("plainly").
+* [Experimental feature] Support verifying code that might get stuck by
+  distinguishing "non-stuck" vs. "(potentially) stuck" weakest
+  preconditions. (See [Swasey et al., OOPSLA '17] for examples.) The non-stuck
+  `WP e @ E {{ Φ }}` ensures that, as `e` runs, it does not get stuck. The stuck
+  `WP e @ E ?{{ Φ }}` ensures that, as usual, all invariants are preserved while
+  `e` runs, but it permits execution to get stuck. The former implies the
+  latter. The full judgment is `WP e @ s; E {{ Φ }}`, where non-stuck WP uses
+  *stuckness bit* `s = NotStuck` while stuck WP uses `s = MaybeStuck`.
+
+**Changes in Coq:**
+
+* Move the `prelude` folder to its own project:
+  [coq-std++](https://gitlab.mpi-sws.org/robbertkrebbers/coq-stdpp)
+* Some extensions/improvements of heap_lang:
+  - Improve handling of pure (non-state-dependent) reductions.
+  - Add fetch-and-add (`FAA`) operation.
+  - Add syntax for all Coq's binary operations on `Z`.
+* Generalize `saved_prop` to let the user choose the location of the type-level
+  later.  Rename the general form to `saved_anything`.  Provide `saved_prop` and
+  `saved_pred` as special cases.
+* Improved big operators:
+  + They are no longer tied to cameras, but work on any monoid
+  + The version of big operations over lists was redefined so that it enjoys
+    more definitional equalities.
+* Rename some things and change notation:
+  - The unit of a camera: `empty` -> `unit`, `∅` -> `ε`
+  - Disjointness: `⊥` -> `##`
+  - A proof mode type class `IntoOp` -> `IsOp`
+  - OFEs with all elements being discrete: `Discrete` -> `OfeDiscrete`
+  - OFE elements whose equality is discrete: `Timeless` -> `Discrete`
+  - Timeless propositions: `TimelessP` -> `Timeless`
+  - Camera elements such that `core x = x`: `Persistent` -> `CoreId`
+  - Persistent propositions: `PersistentP` -> `Persistent`
+  - The persistent modality: `always` -> `persistently`
+  - Adequacy for non-stuck weakestpre: `adequate_safe` -> `adequate_not_stuck`
+  - Consistently SnakeCase identifiers:
+    + `CMRAMixin` -> `CmraMixin`
+    + `CMRAT` -> `CmraT`
+    + `CMRATotal` -> `CmraTotal`
+    + `CMRAMorphism` -> `CmraMorphism`
+    + `CMRADiscrete` -> `CmraDiscrete`
+    + `UCMRAMixin` -> `UcmraMixin`
+    + `UCMRAT` -> `UcmraT`
+    + `DRAMixin` -> `DraMixin`
+    + `DRAT` -> `DraT`
+    + `STS` -> `Sts`
+  - Many lemmas also changed their name.  `always_*` became `persistently_*`,
+    and furthermore: (the following list is not complete)
+    + `impl_wand` -> `impl_wand_1` (it only involves one direction of the
+      equivalent)
+    + `always_impl_wand` -> `impl_wand`
+    + `always_and_sep_l` -> `and_sep_l`
+    + `always_and_sep_r` -> `and_sep_r`
+    + `always_sep_dup` -> `sep_dup`
+    + `wand_impl_always` -> `impl_wand_persistently` (additionally,
+      the direction of this equivalence got swapped for consistency's sake)
+    + `always_wand_impl` -> `persistently_impl_wand` (additionally, the
+      direction of this equivalence got swapped for consistency's sake)
+  The following `sed` snippet should get you most of the way (on macOS you will
+  have to replace `sed` by `gsed`, installed via e.g. `brew install gnu-sed`):
+```
+sed -i 's/\bPersistentP\b/Persistent/g; s/\bTimelessP\b/Timeless/g; s/\bCMRADiscrete\b/CmraDiscrete/g; s/\bCMRAT\b/CmraT/g; s/\bCMRAMixin\b/CmraMixin/g; s/\bUCMRAT\b/UcmraT/g; s/\bUCMRAMixin\b/UcmraMixin/g; s/\bSTS\b/Sts/g' $(find -name "*.v")
+```
+* `PersistentL` and `TimelessL` (persistence and timelessness of lists of
+  propositions) are replaces by `TCForall` from std++.
+* Fix a bunch of consistency issues in the proof mode, and make it overall more
+  usable.  In particular:
+  - All proof mode tactics start the proof mode if necessary; `iStartProof` is
+    no longer needed and should only be used for building custom proof mode
+    tactics.
+  - Change in the grammar of specialization patterns: `>[...]` -> `[> ...]`
+  - Various new specification patterns for `done` and framing.
+  - There is common machinery for symbolic execution of pure reductions. This
+    is provided by the type classes `PureExec` and `IntoVal`.
+  - There is a new connective `tc_opaque`, which can be used to make definitions
+    opaque for type classes, and thus opaque for most tactics of the proof
+    mode.
+  - Define Many missing type class instances for distributing connectives.
+  - Implement the tactics `iIntros (?)` and `iIntros "!#"` (i.e. `iAlways`)
+    using type classes. This makes them more generic, e.g., `iIntros (?)` also
+    works when the universal quantifier is below a modality, and `iAlways` also
+    works for the plainness modality.  A breaking change, however, is that these
+    tactics now no longer work when the universal quantifier or modality is
+    behind a type class opaque definition.  Furthermore, this can change the
+    name of anonymous identifiers introduced with the "%" pattern.
+* Make `ofe_fun` dependently typed, subsuming `iprod`.  The latter got removed.
+* Define the generic `fill` operation of the `ectxi_language` construct in terms
+  of a left fold instead of a right fold. This gives rise to more definitional
+  equalities.
+* The language hierarchy (`language`, `ectx_language`, `ectxi_language`) is now
+  fully formalized using canonical structures instead of using a mixture of
+  type classes and canonical structures. Also, it now uses explicit mixins. The
+  file `program_logic/ectxi_language` contains some documentation on how to
+  setup Iris for your language.
+* Restore the original, stronger notion of atomicity alongside the weaker
+  notion. These are `Atomic a e` where the stuckness bit `s` indicates whether
+  expression `e` is weakly (`a = WeaklyAtomic`) or strongly
+  (`a = StronglyAtomic`) atomic.
+* Various improvements to `solve_ndisj`.
+* Use `Hint Mode` to prevent Coq from making arbitrary guesses in the presence
+  of evars, which often led to divergence. There are a few places where type
+  annotations are now needed.
+* The rules `internal_eq_rewrite` and `internal_eq_rewrite_contractive` are now
+  stated in the logic, i.e., they are `iApply`-friendly.
 
 ## Iris 3.0.0 (released 2017-01-11)
 

CONTRIBUTING.md

-# CONTRIBUTING TO THE IRIS COQ DEVELOPMENT
-
-Discussion about the Iris Coq development happens on the mailing list
-[iris-club@lists.mpi-sws.org](https://lists.mpi-sws.org/listinfo/iris-club).
-This is also the right place to ask questions.
-
-If you want to report a bug, please use the
-[issue tracker](https://gitlab.mpi-sws.org/FP/iris-coq/issues).  You will have
-to create an account at the
-[MPI-SWS GitLab](https://gitlab.mpi-sws.org/users/sign_in) (use the "Register"
-tab).
-
-To contribute code, please contact [Ralf Jung](https://gitlab.mpi-sws.org/jung)
-to enable personal projects for your account.  Then you can fork the
-[Iris git repository](https://gitlab.mpi-sws.org/FP/iris-coq/), make your
-changes in your fork, and create a merge request.
+# Contributing to the Iris Coq Development
+
+Here you can find some how-tos for various thing sthat might come up when doing
+Iris development.  This is for contributing to Iris itself; see
+[the README](README.md#further-resources) for resources helpful for all Iris
+users.
+
+To work on Iris itself, you need to install its build-dependencies.  Again we
+recommend you do that with opam (2.0.0 or newer).  This requires the following
+two repositories:
+
+    opam repo add coq-released https://coq.inria.fr/opam/released
+    opam repo add iris-dev https://gitlab.mpi-sws.org/iris/opam.git
+
+Once you got opam set up, run `make builddep` to install the right versions
+of the dependencies.
+
+Run `make -jN` to build the full development, where `N` is the number of your
+CPU cores.
+
+To update Iris, do `git pull`.  After an update, the development may fail to
+compile because of outdated dependencies.  To fix that, please run `opam update`
+followed by `make builddep`.
+
+## How to submit a merge request
+
+To contribute code, you need an MPI-SWS GitLab account as described on the
+[chat page](https://iris-project.org/chat.html).  Then you can fork the
+[Iris git repository][iris], make your changes in your fork, and create a merge
+request.  If forking fails with an error, please send your MPI-SWS GitLab
+username to [Ralf Jung][jung] to unlock forks for your account.
+
+Please do *not* use the master branch of your fork, that might confuse CI.  Use
+a feature branch instead.
+
+[jung]: https://gitlab.mpi-sws.org/jung
+[iris]: https://gitlab.mpi-sws.org/iris/iris
+
+We prefer small and self-contained merge requests that add a single feature
+over merge requests that add arbitrary collections of lemmas. Small merge
+requests are easier to review, and will typically be merged more quickly
+(because it avoids blocking the whole merge request on a single
+discussion).
+
+Please follow the coding style laid out in our [style
+guide](docs/style_guide.md).
+
+## How to update the std++ dependency
+
+* Do the change in std++, push it.
+* Wait for CI to publish a new std++ version on the opam archive, then run
+  `opam update iris-dev`.
+* In Iris, change the `opam` file to depend on the new version.
+  (In case you do not use opam yourself, you can see recently published versions
+  [in this repository](https://gitlab.mpi-sws.org/iris/opam/commits/master).)
+* Run `make builddep` (in Iris) to install the new version of std++.
+  You may have to do `make clean` as Coq will likely complain about .vo file
+  mismatches.
+
+## How to write/update test cases
+
+The files in `tests/` are test cases.  Each of the `.v` files comes with a
+matching `.ref` file containing the expected output of `coqc`.  Adding `Show.`
+in selected places in the proofs makes `coqc` print the current goal state.
+This is used to make sure the proof mode prints goals and reduces terms the way
+we expect it to.  You can run `make MAKE_REF=1` to re-generate all the `.ref` files;
+this is useful after adding or removing `Show.` from a test.  If you do this,
+make sure to check the diff for any unexpected changes in the output!
+
+Some test cases have per-Coq-version `.ref` files (e.g., `atomic.8.8.ref` is a
+Coq-8.8-specific `.ref` file).  If you change one of these, remember to update
+*all* the `.ref` files.
+
+If you want to compile without tests run `make NO_TEST=1`.
+
+## How to build/install only one package
+
+Iris is split into multiple packages that can be installed separately via opam.
+You can invoke the Makefile of a particular package by doing `./make-package
+$PACKAGE $MAKE_ARGS`, where `$MAKE_ARGS` are passed to `make` (so you can use
+the usual `-jN`, `install`, ...).  This should only rarely be necessary. For
+example, if you are not using opam and you want to install only the `iris`
+package (without HeapLang, to avoid waiting on that part of the build), you can
+do `./make-package iris install`.  (If you are using opam, you can achieve the
+same by pinning `coq-iris` to your Iris checkout.)
+
+Note that `./make-package` will never run the test suite, so please always do a
+regular `make -jN` before submitting an MR.
+
+## How to test effects on reverse dependencies
+
+The `iris-bot` script makes it easy to test the effect of a branch on reverse
+dependencies. It can start tests ensuring they all still build, and it can do
+comparative timing runs.
+
+If you have suitable permissions, you can trigger these builds yourself.
+But first, you need to do some setup: you need to create a GitLab access token
+and set the `GITLAB_TOKEN` environment variable to it. Go to
+<https://gitlab.mpi-sws.org/-/profile/personal_access_tokens>, pick a suitable
+name (such as "iris-bot"), select the "api" scope, and then click "Create
+personal access token". Copy the value it shows and store it in some suitable
+place; you will not be able to retrieve this value from GitLab in the future!
+For example, you could create a `.env` file in your Iris clone containing:
+```
+export GITLAB_TOKEN=<your token here>
+```
+Then you can easily get the token back into the environment via `. .env`.
+
+Once that setup is done, you can now use `iris-bot`. Set at least one of
+`IRIS_REV` or `STDPP_REV` to control which branches of these projects to build
+against (they default to the default git branch). `IRIS_REPO` and `STDPP_REPO`
+can be used to control the repository in which the branch is situated. Setting
+`IRIS` to "user:branch" will use the given branch on that user's fork of Iris,
+and similar for `STDPP`.
+
+Supported commands:
+- `./iris-bot build [$filter]`: Builds all reverse dependencies against the
+  given branches. The optional `filter` argument only builds projects whose
+  names contains that string.
+- `./iris-bot time $project`: Measure the impact of this branch on the build
+  time of the given reverse dependency. Only Iris branches are supported for
+  now.
+
+Examples:
+- `IRIS_REV=myname/mybranch ./iris-bot build` builds *all* reverse dependencies
+  against `myname/mybranch` from the main Iris repository.
+- `IRIS=user:branch ./iris-bot build examples` builds the [examples] against
+  the `branch` in `user`'s fork of Iris.
+- `IRIS_REV=myname/mybranch ./iris-bot time examples` measures the timing impact
+  of `myname/mybranch` from the main Iris repository on the [examples].
+
+[examples]: https://gitlab.mpi-sws.org/iris/examples

LICENSE

-The source code (i.e., everything except for files in the docs/ folder) in this
-development is licensed under the terms of the BSD license, while the
-documentation (i.e., everything inside the docs/ folder) is licensed under the
-terms of the CC-BY 4.0 license.  Fur further details, see LICENSE-CODE and
-LICENSE-DOCS, respectively.
+The source code (i.e., everything except for files in the docs/ and tex/
+folders) in this development is licensed under the terms of the BSD license,
+while the documentation (i.e., everything inside the docs/ and tex/ folders) is
+licensed under the terms of the CC-BY 4.0 license.  Fur further details, see
+LICENSE-CODE and LICENSE-DOCS, respectively.

LICENSE-CODE

-All files in this development, excluding those in docs/, are distributed
-under the terms of the BSD license, included below.
+All files in this development, excluding those in docs/ and tex/, are
+distributed under the terms of the 3-clause BSD license
+(https://opensource.org/licenses/BSD-3-Clause), included below.
 
-------------------------------------------------------------------------------
+Copyright: Iris developers and contributors
 
-                            BSD LICENCE
+------------------------------------------------------------------------------
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
@@ -12,17 +13,17 @@ modification, are permitted provided that the following conditions are met:
     * Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.
-    * Neither the name of the <organization> nor the
-      names of its contributors may be used to endorse or promote products
-      derived from this software without specific prior written permission.
+    * Neither the name of the copyright holder nor the names of its contributors
+      may be used to endorse or promote products derived from this software
+      without specific prior written permission.
 
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
-DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
-ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

LICENSE-DOCS

-All files in the docs/ folder of this development are distributed
+All files in the docs/ and tex/ folders of this development are distributed
 under the terms of the CC-BY 4.0 license <https://creativecommons.org/licenses/by/4.0/>.
 
 For your convenience, a plain-text version of the license is included below.

Makefile

-# Process flags
-ifeq ($(Y), 1)
-	YFLAG=-y
-endif
+# Default target
+all: Makefile.coq
+	+@$(MAKE) -f Makefile.coq all
+.PHONY: all
+
+# Build with dune.
+# This exists only for CI; you should just call `dune build` directly instead.
+dune:
+	@dune build --display=short
+.PHONY: dune
+
+# Permit local customization
+-include Makefile.local
 
 # Forward most targets to Coq makefile (with some trick to make this phony)
 %: Makefile.coq phony
-	+@make -f Makefile.coq $@
-
-all: Makefile.coq
-	+@make -f Makefile.coq all
+	@#echo "Forwarding $@"
+	+@$(MAKE) -f Makefile.coq $@
+phony: ;
+.PHONY: phony
 
 clean: Makefile.coq
-	+@make -f Makefile.coq clean
-	find theories \( -name "*.v.d" -o -name "*.vo" -o -name "*.aux" -o -name "*.cache" -o -name "*.glob" -o -name "*.vio" \) -print -delete
-	rm -f Makefile.coq
+	+@$(MAKE) -f Makefile.coq clean
+	@# Make sure not to enter the `_opam` folder.
+	find [a-z]*/ \( -name "*.d" -o -name "*.vo" -o -name "*.vo[sk]" -o -name "*.aux" -o -name "*.cache" -o -name "*.glob" -o -name "*.vio" \) -print -delete || true
+	rm -f Makefile.coq .lia.cache builddep/*
+.PHONY: clean
 
-# Create Coq Makefile. POSIX awk can't do in-place editing, but coq_makefile wants the real filename, so we do some file gymnastics.
-Makefile.coq: _CoqProject Makefile awk.Makefile
-	coq_makefile -f _CoqProject -o Makefile.coq
-	mv Makefile.coq Makefile.coq.tmp && awk -f awk.Makefile Makefile.coq.tmp > Makefile.coq && rm Makefile.coq.tmp
+# Create Coq Makefile.
+Makefile.coq: _CoqProject Makefile
+	"$(COQBIN)coq_makefile" -f _CoqProject -o Makefile.coq $(EXTRA_COQFILES)
 
 # Install build-dependencies
-build-dep:
-	build/opam-pins.sh < opam.pins
-	opam upgrade $(YFLAG) # it is not nice that we upgrade *all* packages here, but I found no nice way to upgrade only those that we pinned
-	opam pin add opam-builddep-temp "$$(pwd)#HEAD" -k git -n -y
-	opam install opam-builddep-temp --deps-only $(YFLAG)
-	opam pin remove opam-builddep-temp
-
-# Some files that do *not* need to be forwarded to Makefile.coq
-Makefile: ;
-_CoqProject: ;
-awk.Makefile: ;
-
-# Phony targets (i.e. targets that should be run no matter the timestamps of the involved files)
-phony: ;
-.PHONY: all clean phony
+OPAMFILES=$(wildcard *.opam)
+BUILDDEPFILES=$(addsuffix -builddep.opam, $(addprefix builddep/,$(basename $(OPAMFILES))))
+
+builddep/%-builddep.opam: %.opam Makefile
+	@echo "# Creating builddep package for $<."
+	@mkdir -p builddep
+	@sed <$< -E 's/^(build|install|remove):.*/\1: []/; s/"(.*)"(.*= *version.*)$$/"\1-builddep"\2/;' >$@
+
+builddep-opamfiles: $(BUILDDEPFILES)
+.PHONY: builddep-opamfiles
+
+builddep: builddep-opamfiles
+	@# We want opam to not just install the build-deps now, but to also keep satisfying these
+	@# constraints.  Otherwise, `opam upgrade` may well update some packages to versions
+	@# that are incompatible with our build requirements.
+	@# To achieve this, we create a fake opam package that has our build-dependencies as
+	@# dependencies, but does not actually install anything itself.
+	@echo "# Installing builddep packages."
+	@opam install $(OPAMFLAGS) $(BUILDDEPFILES)
+.PHONY: builddep
+
+# Backwards compatibility target
+build-dep: builddep
+.PHONY: build-dep
+
+# Some files that do *not* need to be forwarded to Makefile.coq.
+# ("::" lets Makefile.local overwrite this.)
+Makefile Makefile.local _CoqProject $(OPAMFILES):: ;

Makefile.coq.local

+# use NO_TEST=1 to skip the tests
+NO_TEST:=
+
+# use MAKE_REF=1 to generate new reference files
+MAKE_REF:=
+
+# Only test reference output on known versions of Coq, to avoid blocking
+# Coq CI when they change the printing a little.
+# Need to make this a lazy variable (`=` instead of `:=`) since COQ_VERSION is only set later.
+COQ_REF=$(shell echo "$(COQ_VERSION)" | grep -E "^8\.(20)\." -q && echo 1)
+
+# Run tests interleaved with main build.  They have to be in the same target for this.
+real-all: style $(if $(NO_TEST),,test)
+
+style: $(VFILES) coq-lint.sh
+# Make sure everything imports the options, and some general linting.
+	$(SHOW)"COQLINT"
+	$(HIDE)for FILE in $(VFILES); do \
+	  if ! grep -F -q 'From iris.prelude Require Import options.' "$$FILE"; then echo "ERROR: $$FILE does not import 'options'."; echo; exit 1; fi ; \
+	  ./coq-lint.sh "$$FILE" || exit 1; \
+	done
+# Make sure main Iris does not import other Iris packages.
+	$(HIDE)if grep -E 'iris\.(heap_lang|deprecated|unstable)' --include "*.v" -R iris; then echo "ERROR: Iris may not import modules from other Iris packages (see above for violations)."; echo; exit 1; fi
+.PHONY: style
+
+# the test suite
+TESTFILES:=$(shell find tests -name "*.v")
+NORMALIZER:=test-normalizer.sed
+
+test: $(TESTFILES:.v=.vo)
+.PHONY: test
+
+COQ_TEST=$(COQTOP) $(COQDEBUG) -batch -test-mode
+
+tests/.coqdeps.d: $(TESTFILES)
+	$(SHOW)'COQDEP TESTFILES'
+	$(HIDE)$(COQDEP) -dyndep var $(COQMF_COQLIBS_NOML) $^ $(redir_if_ok)
+-include tests/.coqdeps.d
+
+# Main test script (comments out-of-line because macOS otherwise barfs?!?)
+# - Determine reference file (`REF`).
+# - Print user-visible status line.
+# - unset env vars that change Coq's output
+# - Dump Coq output into a temporary file.
+# - Run `sed -i` on that file in a way that works on macOS.
+# - Either compare the result with the reference file, or move it over the reference file.
+# - Cleanup, and mark as done for make.
+$(TESTFILES:.v=.vo): %.vo: %.v $(if $(MAKE_REF),,%.ref) $(NORMALIZER)
+	$(HIDE)REF=$*".ref" && \
+	  echo "COQTEST$(if $(COQ_REF),$(if $(MAKE_REF), [make ref],), [ref ignored]) $< (ref: $$REF)" && \
+	  TMPFILE="$$(mktemp)" && \
+	  unset OCAMLRUNPARAM && \
+	  $(TIMER) $(COQ_TEST) $(COQFLAGS) $(COQLIBS) -load-vernac-source $< > "$$TMPFILE" && \
+	  sed -E -f $(NORMALIZER) "$$TMPFILE" > "$$TMPFILE".new && \
+	  mv "$$TMPFILE".new "$$TMPFILE" && \
+	  $(if $(COQ_REF),\
+	    $(if $(MAKE_REF),mv "$$TMPFILE" "$$REF",diff --strip-trailing-cr -u "$$REF" "$$TMPFILE"), \
+	    true \
+	  ) && \
+	  rm -f "$$TMPFILE" && \
+	  touch $@

ProofMode.md

-Tactic overview
-===============
-
-Many of the tactics below apply to more goals than described in this document
-since the behavior of these tactics can be tuned via instances of the type
-classes in the file [proofmode/classes](proofmode/classes.v). Most notable, many
-of the tactics can be applied when the to be introduced or to be eliminated
-connective appears under a later, an update modality, or in the conclusion of a
-weakest precondition.
-
-Applying hypotheses and lemmas
-------------------------------
-
-- `iExact "H"`  : finish the goal if the conclusion matches the hypothesis `H`
-- `iAssumption` : finish the goal if the conclusion matches any hypothesis
-- `iApply pm_trm` : match the conclusion of the current goal against the
-  conclusion of `pm_trm` and generates goals for the premises of `pm_trm`. See
-  proof mode terms below.
-  If the applied term has more premises than given specialization patterns, the
-  pattern is extended with `[] ... []`.  As a consequence, all unused spatial
-  hypotheses move to the last premise.
-
-Context management
-------------------
-
-- `iIntros (x1 ... xn) "ipat1 ... ipatn"` : introduce universal quantifiers
-  using Coq introduction patterns `x1 ... xn` and implications/wands using proof
-  mode introduction patterns `ipat1 ... ipatn`.
-- `iClear (x1 ... xn) "selpat"` : clear the hypotheses given by the selection
-  pattern `selpat` and the Coq level hypotheses/variables `x1 ... xn`.
-- `iRevert (x1 ... xn) "selpat"` : revert the hypotheses given by the selection
-  pattern `selpat` into wands, and the Coq level hypotheses/variables
-  `x1 ... xn` into universal quantifiers. Persistent hypotheses are wrapped into
-  the always modality.
-- `iRename "H1" into "H2"` : rename the hypothesis `H1` into `H2`.
-- `iSpecialize pm_trm` : instantiate universal quantifiers and eliminate
-  implications/wands of a hypothesis `pm_trm`. See proof mode terms below.
-- `iSpecialize pm_trm as #` : instantiate universal quantifiers and eliminate
-  implications/wands of a hypothesis whose conclusion is persistent. In this
-  case, all hypotheses can be used for proving the premises, as well as for
-  the resulting goal.
-- `iPoseProof pm_trm as "H"` : put `pm_trm` into the context as a new hypothesis
-  `H`.
-- `iAssert P with "spat" as "ipat"` : generates a new subgoal `P` and adds the
-  hypothesis `P` to the current goal. The specialization pattern `spat`
-  specifies which hypotheses will be consumed by proving `P`. The introduction
-  pattern `ipat` specifies how to eliminate `P`.
-  In case all branches of `ipat` start with a `#` (which causes `P` to be moved
-  to the persistent context) or with an `%` (which causes `P` to be moved to the
-  pure Coq context), then one can use all hypotheses for proving `P` as well as
-  for proving the current goal.
-- `iAssert P as %cpat` : assert `P` and eliminate it using the Coq introduction
-  pattern `cpat`. All hypotheses can be used for proving `P` as well as for
-  proving the current goal.
-
-Introduction of logical connectives
------------------------------------
-
-- `iPureIntro` : turn a pure goal into a Coq goal. This tactic works for goals
-  of the shape `■ φ`, `a ≡ b` on discrete COFEs, and `✓ a` on discrete CMRAs.
-
-- `iLeft` : left introduction of disjunction.
-- `iRight` : right introduction of disjunction.
-
-- `iSplit` : introduction of a conjunction, or separating conjunction provided
-  one of the operands is persistent.
-- `iSplitL "H1 ... Hn"` : introduction of a separating conjunction. The
-  hypotheses `H1 ... Hn` are used for the left conjunct, and the remaining ones
-  for the right conjunct. Persistent hypotheses are ignored, since these do not
-  need to be split.
-- `iSplitR "H0 ... Hn"` : symmetric version of the above.
-- `iExist t1, .., tn` : introduction of an existential quantifier.
-
-Elimination of logical connectives
-----------------------------------
-
-- `iExFalso` : Ex falso sequitur quod libet.
-- `iDestruct pm_trm as (x1 ... xn) "ipat"` : elimination of a series of
-  existential quantifiers using Coq introduction patterns `x1 ... xn`, and
-  elimination of an object level connective using the proof mode introduction
-  pattern `ipat`.
-  In case all branches of `ipat` start with a `#` (which causes the hypothesis
-  to be moved to the persistent context) or with an `%` (which causes the
-  hypothesis to be moved to the pure Coq context), then one can use all
-  hypotheses for proving the premises of `pm_trm`, as well as for proving the
-  resulting goal. Note that in this case the hypotheses still need to be
-  subdivided among the spatial premises.
-- `iDestruct pm_trm as %cpat` : elimination of a pure hypothesis using the Coq
-  introduction pattern `cpat`. When using this tactic, all hypotheses can be
-  used for proving the premises of `pm_trm`, as well as for proving the
-  resulting goal.
-
-Separating logic specific tactics
----------------------------------
-
-- `iFrame (t1 .. tn) "selpat"` : cancel the Coq terms (or Coq hypotheses)
-  `t1 ... tn` and Iris hypotheses given by `selpat` in the goal. The constructs
-  of the selection pattern have the following meaning:
-
-  + `%` : repeatedly frame hypotheses from the Coq context.
-  + `#` : repeatedly frame hypotheses from the persistent context.
-  + `∗` : frame as much of the spatial context as possible.
-
-  Notice that framing spatial hypotheses makes them disappear, but framing Coq
-  or persistent hypotheses does not make them disappear.
-
-  This tactic finishes the goal in case everything in the conclusion has been
-  framed.
-- `iCombine "H1" "H2" as "H"` : turns `H1 : P1` and `H2 : P2` into
-  `H : P1 ∗ P2`.
-
-Modalities
-----------
-
-- `iModIntro` : introduction of a modality that is an instance of the
-  `IntoModal` type class. Instances include: later, except 0, basic update and
-  fancy update.
-- `iMod pm_trm as (x1 ... xn) "ipat"` : eliminate a modality `pm_trm` that is
-  an instance of the `ElimModal` type class. Instances include: later, except 0,
-  basic update and fancy update.
-
-The later modality
-------------------
-
-- `iNext n` : introduce `n` laters by stripping that number of laters from all
-  hypotheses. If the argument `n` is not given, it strips one later if the
-  leftmost conjunct is of the shape `▷ P`, or `n` laters if the leftmost
-  conjunct is of the shape `▷^n P`.
-- `iLöb as "IH" forall (x1 ... xn) "selpat"` : perform Löb induction by
-  generating a hypothesis `IH : ▷ goal`. The tactic generalizes over the Coq
-  level variables `x1 ... xn`, the hypotheses given by the selection pattern
-  `selpat`, and the spatial context.
-
-Induction
----------
-
-- `iInduction x as cpat "IH" forall (x1 ... xn) "selpat"` : perform induction on
-  the Coq term `x`. The Coq introduction pattern is used to name the introduced
-  variables. The induction hypotheses are inserted into the persistent context
-  and given fresh names prefixed `IH`. The tactic generalizes over the Coq level
-  variables `x1 ... xn`, the hypotheses given by the selection pattern `selpat`,
-  and the spatial context.
-
-Rewriting
----------
-
-- `iRewrite pm_trm` : rewrite an equality in the conclusion.
-- `iRewrite pm_trm in "H"` : rewrite an equality in the hypothesis `H`.
-
-Iris
-----
-
-- `iInv N as (x1 ... xn) "ipat" "Hclose"` : open the invariant `N`, the update
-  for closing the invariant is put in a hypothesis named `Hclose`.
-
-Miscellaneous
--------------
-
-- The tactic `done` is extended so that it also performs `iAssumption` and
-  introduces pure connectives.
-- The proof mode adds hints to the core `eauto` database so that `eauto`
-  automatically introduces: conjunctions and disjunctions, universal and
-  existential quantifiers, implications and wand, always, later and update
-  modalities, and pure connectives.
-
-Selection patterns
-==================
-
-Selection patterns are used to select hypotheses in the tactics `iRevert`,
-`iClear`, `iFrame`, `iLöb` and `iInduction`. The proof mode supports the
-following _selection patterns_:
-
-- `H` : select the hypothesis named `H`.
-- `%` : select the entire pure/Coq context.
-- `#` : select the entire persistent context.
-- `∗` : select the entire spatial context.
-
-Introduction patterns
-=====================
-
-Introduction patterns are used to perform introductions and eliminations of
-multiple connectives on the fly. The proof mode supports the following
-_introduction patterns_:
-
-- `H` : create a hypothesis named `H`.
-- `?` : create an anonymous hypothesis.
-- `_` : remove the hypothesis.
-- `$` : frame the hypothesis in the goal.
-- `[ipat ipat]` : (separating) conjunction elimination.
-- `[ipat|ipat]` : disjunction elimination.
-- `[]` : false elimination.
-- `%` : move the hypothesis to the pure Coq context (anonymously).
-- `# ipat` : move the hypothesis to the persistent context.
-- `> ipat` : eliminate a modality (if the goal permits).
-
-Apart from this, there are the following introduction patterns that can only
-appear at the top level:
-
-- `{H1 ... Hn}` : clear `H1 ... Hn`.
-- `{$H1 ... $Hn}` : frame `H1 ... Hn` (this pattern can be mixed with the
-  previous pattern, e.g., `{$H1 H2 $H3}`).
-- `!%` : introduce a pure goal (and leave the proof mode).
-- `!#` : introduce an always modality (given that the spatial context is empty).
-- `!>` : introduce a modality.
-- `/=` : perform `simpl`.
-- `*` : introduce all universal quantifiers.
-- `**` : introduce all universal quantifiers, as well as all arrows and wands.
-
-For example, given:
-
-        ∀ x, x = 0 ⊢ □ (P → False ∨ □ (Q ∧ ▷ R) -∗ P ∗ ▷ (R ∗ Q ∧ x = pred 2)).
-
-You can write
-
-        iIntros (x) "% !# $ [[] | #[HQ HR]] /= !>".
-
-which results in:
-
-        x : nat
-        H : x = 0
-        ______________________________________(1/1)
-        "HQ" : Q
-        "HR" : R
-        --------------------------------------□
-        R ∗ Q ∧ x = 1
-
-
-Specialization patterns
-=======================
-
-Since we are reasoning in a spatial logic, when eliminating a lemma or
-hypothesis of type ``P_0 -∗ ... -∗ P_n -∗ R``, one has to specify how the
-hypotheses are split between the premises. The proof mode supports the following
-_specification patterns_ to express splitting of hypotheses:
-
-- `H` : use the hypothesis `H` (it should match the premise exactly). If `H` is
-  spatial, it will be consumed.
-- `[H1 ... Hn]` : generate a goal with the (spatial) hypotheses `H1 ... Hn` and
-  all persistent hypotheses. The spatial hypotheses among `H1 ... Hn` will be
-  consumed. Hypotheses may be prefixed with a `$`, which results in them being
-  framed in the generated goal.
-- `[-H1 ... Hn]` : negated form of the above pattern.
-- `>[H1 ... Hn]` : same as the above pattern, but can only be used if the goal
-  is a modality, in which case the modality will be kept in the generated goal
-  for the premise will be wrapped into the modality.
-- `>[-H1 ... Hn]`  : negated form of the above pattern.
-- `>` : shorthand for `>[-]` (typically used for the last premise of an applied
-  lemma).
-- `[#]` : This pattern can be used when eliminating `P -∗ Q` with `P`
-  persistent. Using this pattern, all hypotheses are available in the goal for
-  `P`, as well the remaining goal.
-- `[%]` : This pattern can be used when eliminating `P -∗ Q` when `P` is pure.
-  It will generate a Coq goal for `P` and does not consume any hypotheses.
-
-For example, given:
-
-        H : □ P -∗ P 2 -∗ x = 0 -∗ Q1 ∗ Q2
-
-You can write:
-
-        iDestruct ("H" with "[#] [H1 H2] [%]") as "[H4 H5]".
-
-Proof mode terms
-================
-
-Many of the proof mode tactics (such as `iDestruct`, `iApply`, `iRewrite`) can
-take both hypotheses and lemmas, and allow one to instantiate universal
-quantifiers and implications/wands of these hypotheses/lemmas on the fly.
-
-The syntax for the arguments of these tactics, called _proof mode terms_, is:
-
-        (H $! t1 ... tn with "spat1 .. spatn")
-
-Here, `H` can be both a hypothesis, as well as a Coq lemma whose conclusion is
-of the shape `P ⊢ Q`. In the above, `t1 ... tn` are arbitrary Coq terms used
-for instantiation of universal quantifiers, and `spat1 .. spatn` are
-specialization patterns to eliminate implications and wands.
-
-Proof mode terms can be written down using the following short hands too:
-
-        (H with "spat1 .. spatn")
-        (H $! t1 ... tn)
-        H
-

README.md

-# IRIS COQ DEVELOPMENT
+# Iris Coq Development [[coqdoc]](https://plv.mpi-sws.org/coqdoc/iris/)
 
-This is the Coq development of the [Iris Project](http://iris-project.org).
+This is the Coq development of the [Iris Project](http://iris-project.org),
+which includes [MoSeL](http://iris-project.org/mosel/), a general proof mode
+for carrying out separation logic proofs in Coq.
 
-## Prerequisites
+For using the Coq library, check out the
+[API documentation](https://plv.mpi-sws.org/coqdoc/iris/).
+
+For understanding the theory of Iris, a LaTeX version of the core logic
+definitions and some derived forms is available in
+[tex/iris.tex](tex/iris.tex).  A compiled PDF version of this document is
+[available online](http://plv.mpi-sws.org/iris/appendix-3.4.pdf).
+
+## Side-effects
+
+Importing Iris has some side effects as the library sets some global options.
+
+* First of all, Iris imports std++, so the
+  [std++ side-effects](https://gitlab.mpi-sws.org/iris/stdpp/#side-effects)
+  apply.
+* On top of that, Iris imports ssreflect, which replaces the default `rewrite`
+  tactic with the ssreflect version. However, `done` is overwritten to keep
+  using the std++ version of the tactic.  We also set `SsrOldRewriteGoalsOrder`
+  and re-open `general_if_scope` to un-do some effects of ssreflect.
+
+## Building Iris
+
+### Prerequisites
 
 This version is known to compile with:
 
- - Coq 8.6
- - Ssreflect 1.6.1
- - A development version of [std++](https://gitlab.mpi-sws.org/robbertkrebbers/coq-stdpp)
+ - Coq 8.19.2 / 8.20.1
+ - A development version of [std++](https://gitlab.mpi-sws.org/iris/stdpp)
+
+Generally we always aim to support the last two stable Coq releases. Support for
+older versions will be dropped when it is convenient.
+
+If you need to work with older versions of Coq, you can check out the
+[tags](https://gitlab.mpi-sws.org/iris/iris/-/tags) for old Iris releases that
+still support them.
 
-The easiest way to install the correct versions of the dependencies is through
-opam.  Coq packages are available on the coq-released repository, set up by the
-command:
+### Working *with* Iris
+
+To use Iris in your own proofs, we recommend you install Iris via opam (2.0.0 or
+newer).  To obtain the latest stable release, you have to add the Coq opam
+repository:
 
     opam repo add coq-released https://coq.inria.fr/opam/released
 
-Once you got opam set up, just run `make build-dep` to install the right
-versions of the dependencies.  When the dependencies change, just run `make
-build-dep` again.
-
-If you need to work with Coq 8.5, please check out the
-[iris-3.0 branch](https://gitlab.mpi-sws.org/FP/iris-coq/tree/iris-3.0).
-
-## Building Instructions
-
-Run `make` to build the full development.
-
-## Structure
-
-* The folder [algebra](theories/algebra) contains the COFE and CMRA
-  constructions as well as the solver for recursive domain equations.
-* The folder [base_logic](theories/base_logic) defines the Iris base logic and
-  the primitive connectives.  It also contains derived constructions that are
-  entirely independent of the choice of resources.
-  * The subfolder [lib](theories/base_logic/lib) contains some generally useful
-    derived constructions.  Most importantly, it defines composeable
-    dynamic resources and ownership of them; the other constructions depend
-    on this setup.
-* The folder [program_logic](theories/program_logic) specializes the base logic
-  to build Iris, the program logic.   This includes weakest preconditions that
-  are defined for any language satisfying some generic axioms, and some derived
-  constructions that work for any such language.
-* The folder [proofmode](theories/proofmode) contains the Iris proof mode, which
-  extends Coq with contexts for persistent and spatial Iris assertions. It also
-  contains tactics for interactive proofs in Iris. Documentation can be found in
-  [ProofMode.md](ProofMode.md).
-* The folder [heap_lang](theories/heap_lang) defines the ML-like concurrent heap
-  language
-  * The subfolder [lib](theories/heap_lang/lib) contains a few derived
+To obtain a development version, also add the Iris opam repository:
+
+    opam repo add iris-dev https://gitlab.mpi-sws.org/iris/opam.git
+
+Either way, you can now install Iris:
+- `opam install coq-iris` will install the libraries making up the Iris logic,
+  but leave it up to you to instantiate the `program_logic.language` interface
+  to define a programming language for Iris to reason about.
+- `opam install coq-iris-heap-lang` will additionally install HeapLang, the
+  default language used by various Iris projects.
+
+To fetch updates later, run `opam update && opam upgrade`.
+
+#### Be notified of breaking changes
+
+We do not guarantee backwards-compatibility, so upgrading Iris may break your
+Iris-using developments.  If you want to be notified of breaking changes, please
+let us know your account name on the
+[MPI-SWS GitLab](https://gitlab.mpi-sws.org/) so we can add you to the
+notification group.  Note that this excludes the "unstable" and "deprecated"
+packages (see below).
+
+#### Use of Iris in submitted artifacts
+
+If you are using Iris as part of an artifact submitted for publication with a
+paper, we recommend you make the artifact self-contained so that it can be built
+in the future without relying in any other server to still exist. However, if
+that is for some reason not possible, and if you are using opam to obtain the
+right version of Iris and you used a `dev.*` version, please let us know which
+exact Iris version you artifact relies on so that we can
+[add it to this wiki page](https://gitlab.mpi-sws.org/iris/iris/-/wikis/Pinned-Iris-package-versions)
+and avoid removing it from our opam repository in the future.
+
+### Working *on* Iris
+
+See the [contribution guide](CONTRIBUTING.md) for information on how to work on
+the Iris development itself.
+
+## Directory Structure
+
+Iris is structured into multiple *packages*, some of which contain multiple
+modules in separate folders.
+
+* The [iris](iris) package contains the language-independent parts of Iris.
+  + The folder [prelude](iris/prelude) contains modules imported everywhere in
+    Iris.
+  + The folder [algebra](iris/algebra) contains the COFE and CMRA
+    constructions as well as the solver for recursive domain equations.
+    - The subfolder [lib](iris/algebra/lib) contains some general derived RA
+      constructions.
+  + The folder [bi](iris/bi) contains the BI++ laws, as well as derived
+    connectives, laws and constructions that are applicable for general BIs.
+    - The subfolder [lib](iris/bi/lib) contains some general derived logical
+      constructions.
+  + The folder [proofmode](iris/proofmode) contains
+    [MoSeL](http://iris-project.org/mosel/), which extends Coq with contexts for
+    intuitionistic and spatial BI++ assertions. It also contains tactics for
+    interactive proofs. Documentation can be found in
+    [proof_mode.md](docs/proof_mode.md).
+  + The folder [base_logic](iris/base_logic) defines the Iris base logic and
+    the primitive connectives.  It also contains derived constructions that are
+    entirely independent of the choice of resources.
+    - The subfolder [lib](iris/base_logic/lib) contains some generally useful
+      derived constructions.  Most importantly, it defines composable
+      dynamic resources and ownership of them; the other constructions depend
+      on this setup.
+  + The folder [program_logic](iris/program_logic) specializes the base logic
+    to build Iris, the program logic.   This includes weakest preconditions that
+    are defined for any language satisfying some generic axioms, and some derived
+    constructions that work for any such language.
+  + The folder [si_logic](iris/si_logic) defines a "plain" step-indexed logic
+    and shows that it is an instance of the BI interface.
+* The [iris_heap_lang](iris_heap_lang) package defines the ML-like concurrent
+  language HeapLang and provides tactic support and proof mode integration.
+  + The subfolder [lib](iris_heap_lang/lib) contains a few derived
     constructions within this language, e.g., parallel composition.
-    Most notable here is [lib/barrier](theories/heap_lang/lib/barrier), the
-    implementation and proof of a barrier as described in
-    <http://doi.acm.org/10.1145/2818638>.
-* The folder [tests](theories/tests) contains modules we use to test our
-  infrastructure. Users of the Iris Coq library should *not* depend on these
-  modules; they may change or disappear without any notice.
-
-## Documentation
-
-A LaTeX version of the core logic definitions and some derived forms is
-available in [docs/iris.tex](docs/iris.tex).  A compiled PDF version of this
-document is [available online](http://plv.mpi-sws.org/iris/appendix-3.0.pdf).
+    For more examples of using Iris and heap_lang, have a look at the
+    [Iris Examples](https://gitlab.mpi-sws.org/iris/examples).
+* The [iris_unstable](iris_unstable) package contains libraries that are not yet
+  ready for inclusion in Iris proper. For each library, there is a corresponding
+  "tracking issue" in the Iris issue tracker (also linked from the library
+  itself) which tracks the work that still needs to be done before moving the
+  library to Iris. No stability guarantees whatsoever are made for this package.
+* The [iris_deprecated](iris_deprecated) package contains libraries that have been
+  removed from Iris proper, but are kept around to give users some more time to
+  switch to their intended replacements. The individual libraries come with comments
+  explaining the deprecation and making recommendations for what to use
+  instead. No stability guarantees whatsoever are made for this package.
+* The folder [tests](tests) contains modules we use to test our
+  infrastructure. These modules are not installed by `make install`, and should
+  not be imported.
+
+Note that the unstable and deprecated packages are not released, so they only
+exist in the development version of Iris.
+
+## Case Studies
+
+The following is a (probably incomplete) list of case studies that use Iris, and
+that should be compatible with this version:
+
+* [Iris Examples](https://gitlab.mpi-sws.org/iris/examples) is where we
+  collect miscellaneous case studies that do not have their own repository.
+* [LambdaRust](https://gitlab.mpi-sws.org/iris/lambda-rust) is a Coq
+  formalization of the core Rust type system.
+* [GPFSL](https://gitlab.mpi-sws.org/iris/gpfsl) is a logic for release-acquire
+  and relaxed memory.
+* [Iron](https://gitlab.mpi-sws.org/iris/iron) is a linear separation logic
+  built on top of Iris for precise reasoning about resources (such as making
+  sure there are no memory leaks).
+* [Actris](https://gitlab.mpi-sws.org/iris/actris) is a separation logic
+  built on top of Iris for session-type based reasoning of message-passing
+  programs.
+
+## Further Resources
+
+Getting along with Iris in Coq:
+
+* The coding style is documented in the [style guide](docs/style_guide.md).
+* Iris proof patterns and conventions are documented in the
+  [proof guide](docs/proof_guide.md).
+* Various notions of equality and logical entailment in Iris and their Coq
+  interface are described in the
+  [equality docs](docs/equalities_and_entailments.md).
+* The Iris tactics are described in the
+  [the Iris Proof Mode (IPM) / MoSeL documentation](docs/proof_mode.md) as well as the
+  [HeapLang documentation](docs/heap_lang.md).
+* The generated coqdoc is [available online](https://plv.mpi-sws.org/coqdoc/iris/).
+
+Contacting the developers:
+
+* Discussion about the Iris Coq development happens in the [Iris
+  Chat](https://iris-project.org/chat.html). This is also the right place to ask
+  questions.
+* If you want to report a bug, please use the
+  [issue tracker](https://gitlab.mpi-sws.org/iris/iris/issues), which requires
+  an MPI-SWS GitLab account. The [chat page](https://iris-project.org/chat.html)
+  describes how to create such an account.
+* To contribute to Iris itself, see the [contribution guide](CONTRIBUTING.md).
+
+Miscellaneous:
+
+* Information on how to set up your editor for unicode input and output is
+  collected in [editor.md](docs/editor.md).
+* If you are writing a paper that uses Iris in one way or another, you could use
+  the [Iris LaTeX macros](tex/iris.sty) for typesetting the various Iris
+  connectives.

_CoqProject

--Q theories iris
--arg -w -arg -notation-overridden,-redundant-canonical-projection,-several-object-files
-theories/algebra/cmra.v
-theories/algebra/cmra_big_op.v
-theories/algebra/cmra_tactics.v
-theories/algebra/sts.v
-theories/algebra/auth.v
-theories/algebra/gmap.v
-theories/algebra/ofe.v
-theories/algebra/base.v
-theories/algebra/dra.v
-theories/algebra/cofe_solver.v
-theories/algebra/agree.v
-theories/algebra/excl.v
-theories/algebra/iprod.v
-theories/algebra/frac.v
-theories/algebra/csum.v
-theories/algebra/list.v
-theories/algebra/vector.v
-theories/algebra/updates.v
-theories/algebra/local_updates.v
-theories/algebra/gset.v
-theories/algebra/coPset.v
-theories/algebra/deprecated.v
-theories/base_logic/upred.v
-theories/base_logic/primitive.v
-theories/base_logic/derived.v
-theories/base_logic/base_logic.v
-theories/base_logic/tactics.v
-theories/base_logic/big_op.v
-theories/base_logic/hlist.v
-theories/base_logic/soundness.v
-theories/base_logic/double_negation.v
-theories/base_logic/deprecated.v
-theories/base_logic/lib/iprop.v
-theories/base_logic/lib/own.v
-theories/base_logic/lib/saved_prop.v
-theories/base_logic/lib/namespaces.v
-theories/base_logic/lib/wsat.v
-theories/base_logic/lib/invariants.v
-theories/base_logic/lib/fancy_updates.v
-theories/base_logic/lib/viewshifts.v
-theories/base_logic/lib/auth.v
-theories/base_logic/lib/sts.v
-theories/base_logic/lib/boxes.v
-theories/base_logic/lib/na_invariants.v
-theories/base_logic/lib/cancelable_invariants.v
-theories/base_logic/lib/counter_examples.v
-theories/base_logic/lib/fractional.v
-theories/base_logic/lib/gen_heap.v
-theories/base_logic/lib/core.v
-theories/program_logic/adequacy.v
-theories/program_logic/lifting.v
-theories/program_logic/weakestpre.v
-theories/program_logic/hoare.v
-theories/program_logic/language.v
-theories/program_logic/ectx_language.v
-theories/program_logic/ectxi_language.v
-theories/program_logic/ectx_lifting.v
-theories/program_logic/ownp.v
-theories/heap_lang/lang.v
-theories/heap_lang/tactics.v
-theories/heap_lang/lifting.v
-theories/heap_lang/notation.v
-theories/heap_lang/lib/spawn.v
-theories/heap_lang/lib/par.v
-theories/heap_lang/lib/assert.v
-theories/heap_lang/lib/lock.v
-theories/heap_lang/lib/spin_lock.v
-theories/heap_lang/lib/ticket_lock.v
-theories/heap_lang/lib/counter.v
-theories/heap_lang/lib/barrier/barrier.v
-theories/heap_lang/lib/barrier/specification.v
-theories/heap_lang/lib/barrier/protocol.v
-theories/heap_lang/lib/barrier/proof.v
-theories/heap_lang/proofmode.v
-theories/heap_lang/adequacy.v
-theories/tests/heap_lang.v
-theories/tests/one_shot.v
-theories/tests/joining_existentials.v
-theories/tests/proofmode.v
-theories/tests/barrier_client.v
-theories/tests/list_reverse.v
-theories/tests/tree_sum.v
-theories/tests/ipm_paper.v
-theories/proofmode/strings.v
-theories/proofmode/tokens.v
-theories/proofmode/coq_tactics.v
-theories/proofmode/environments.v
-theories/proofmode/intro_patterns.v
-theories/proofmode/spec_patterns.v
-theories/proofmode/sel_patterns.v
-theories/proofmode/tactics.v
-theories/proofmode/notation.v
-theories/proofmode/classes.v
-theories/proofmode/class_instances.v
+# Search paths for all packages. They must all match the regex
+# `-Q $PACKAGE[/ ]` so that we can filter out the right ones for each package.
+-Q iris/prelude iris.prelude
+-Q iris/algebra iris.algebra
+-Q iris/si_logic iris.si_logic
+-Q iris/bi iris.bi
+-Q iris/proofmode iris.proofmode
+-Q iris/base_logic iris.base_logic
+-Q iris/program_logic iris.program_logic
+-Q iris_heap_lang iris.heap_lang
+-Q iris_unstable iris.unstable
+-Q iris_deprecated iris.deprecated
+
+# Custom flags (to be kept in sync with the dune file at the root of the repo).
+# We sometimes want to locally override notation, and there is no good way to do that with scopes.
+-arg -w -arg -notation-overridden
+# Cannot use non-canonical projections as it causes massive unification failures
+# (https://github.com/coq/coq/issues/6294).
+-arg -w -arg -redundant-canonical-projection
+# Warning seems incorrect, see https://gitlab.mpi-sws.org/iris/stdpp/-/issues/216
+-arg -w -arg -notation-incompatible-prefix
+# We can't do this migration yet until we require Coq 9.0
+-arg -w -arg -deprecated-from-Coq
+-arg -w -arg -deprecated-dirpath-Coq
+
+iris/prelude/options.v
+iris/prelude/prelude.v
+iris/algebra/monoid.v
+iris/algebra/cmra.v
+iris/algebra/big_op.v
+iris/algebra/cmra_big_op.v
+iris/algebra/sts.v
+iris/algebra/numbers.v
+iris/algebra/view.v
+iris/algebra/auth.v
+iris/algebra/gmap.v
+iris/algebra/ofe.v
+iris/algebra/cofe_solver.v
+iris/algebra/agree.v
+iris/algebra/excl.v
+iris/algebra/functions.v
+iris/algebra/frac.v
+iris/algebra/dfrac.v
+iris/algebra/csum.v
+iris/algebra/list.v
+iris/algebra/vector.v
+iris/algebra/updates.v
+iris/algebra/local_updates.v
+iris/algebra/gset.v
+iris/algebra/gmultiset.v
+iris/algebra/coPset.v
+iris/algebra/proofmode_classes.v
+iris/algebra/ufrac.v
+iris/algebra/reservation_map.v
+iris/algebra/dyn_reservation_map.v
+iris/algebra/max_prefix_list.v
+iris/algebra/mra.v
+iris/algebra/lib/excl_auth.v
+iris/algebra/lib/frac_auth.v
+iris/algebra/lib/ufrac_auth.v
+iris/algebra/lib/dfrac_agree.v
+iris/algebra/lib/gmap_view.v
+iris/algebra/lib/mono_nat.v
+iris/algebra/lib/mono_Z.v
+iris/algebra/lib/mono_list.v
+iris/algebra/lib/gset_bij.v
+iris/si_logic/siprop.v
+iris/si_logic/bi.v
+iris/bi/notation.v
+iris/bi/interface.v
+iris/bi/derived_connectives.v
+iris/bi/extensions.v
+iris/bi/derived_laws.v
+iris/bi/derived_laws_later.v
+iris/bi/plainly.v
+iris/bi/internal_eq.v
+iris/bi/big_op.v
+iris/bi/updates.v
+iris/bi/ascii.v
+iris/bi/bi.v
+iris/bi/monpred.v
+iris/bi/embedding.v
+iris/bi/weakestpre.v
+iris/bi/telescopes.v
+iris/bi/lib/cmra.v
+iris/bi/lib/counterexamples.v
+iris/bi/lib/fixpoint_mono.v
+iris/bi/lib/fixpoint_banach.v
+iris/bi/lib/fractional.v
+iris/bi/lib/laterable.v
+iris/bi/lib/atomic.v
+iris/bi/lib/core.v
+iris/bi/lib/relations.v
+iris/base_logic/upred.v
+iris/base_logic/bi.v
+iris/base_logic/derived.v
+iris/base_logic/proofmode.v
+iris/base_logic/base_logic.v
+iris/base_logic/algebra.v
+iris/base_logic/bupd_alt.v
+iris/base_logic/lib/iprop.v
+iris/base_logic/lib/own.v
+iris/base_logic/lib/saved_prop.v
+iris/base_logic/lib/wsat.v
+iris/base_logic/lib/invariants.v
+iris/base_logic/lib/fancy_updates.v
+iris/base_logic/lib/boxes.v
+iris/base_logic/lib/na_invariants.v
+iris/base_logic/lib/cancelable_invariants.v
+iris/base_logic/lib/gen_heap.v
+iris/base_logic/lib/gen_inv_heap.v
+iris/base_logic/lib/fancy_updates_from_vs.v
+iris/base_logic/lib/proph_map.v
+iris/base_logic/lib/ghost_var.v
+iris/base_logic/lib/mono_nat.v
+iris/base_logic/lib/gset_bij.v
+iris/base_logic/lib/ghost_map.v
+iris/base_logic/lib/later_credits.v
+iris/base_logic/lib/token.v
+iris/program_logic/adequacy.v
+iris/program_logic/lifting.v
+iris/program_logic/weakestpre.v
+iris/program_logic/total_weakestpre.v
+iris/program_logic/total_adequacy.v
+iris/program_logic/language.v
+iris/program_logic/ectx_language.v
+iris/program_logic/ectxi_language.v
+iris/program_logic/ectx_lifting.v
+iris/program_logic/ownp.v
+iris/program_logic/total_lifting.v
+iris/program_logic/total_ectx_lifting.v
+iris/program_logic/atomic.v
+iris/proofmode/base.v
+iris/proofmode/ident_name.v
+iris/proofmode/string_ident.v
+iris/proofmode/tokens.v
+iris/proofmode/coq_tactics.v
+iris/proofmode/ltac_tactics.v
+iris/proofmode/environments.v
+iris/proofmode/reduction.v
+iris/proofmode/intro_patterns.v
+iris/proofmode/spec_patterns.v
+iris/proofmode/sel_patterns.v
+iris/proofmode/tactics.v
+iris/proofmode/notation.v
+iris/proofmode/classes.v
+iris/proofmode/classes_make.v
+iris/proofmode/class_instances.v
+iris/proofmode/class_instances_later.v
+iris/proofmode/class_instances_updates.v
+iris/proofmode/class_instances_embedding.v
+iris/proofmode/class_instances_plainly.v
+iris/proofmode/class_instances_internal_eq.v
+iris/proofmode/class_instances_frame.v
+iris/proofmode/class_instances_make.v
+iris/proofmode/monpred.v
+iris/proofmode/modalities.v
+iris/proofmode/modality_instances.v
+iris/proofmode/proofmode.v
+
+iris_heap_lang/locations.v
+iris_heap_lang/lang.v
+iris_heap_lang/class_instances.v
+iris_heap_lang/pretty.v
+iris_heap_lang/metatheory.v
+iris_heap_lang/tactics.v
+iris_heap_lang/primitive_laws.v
+iris_heap_lang/derived_laws.v
+iris_heap_lang/notation.v
+iris_heap_lang/proofmode.v
+iris_heap_lang/adequacy.v
+iris_heap_lang/total_adequacy.v
+iris_heap_lang/proph_erasure.v
+iris_heap_lang/lib/spawn.v
+iris_heap_lang/lib/par.v
+iris_heap_lang/lib/assert.v
+iris_heap_lang/lib/lock.v
+iris_heap_lang/lib/rw_lock.v
+iris_heap_lang/lib/spin_lock.v
+iris_heap_lang/lib/ticket_lock.v
+iris_heap_lang/lib/rw_spin_lock.v
+iris_heap_lang/lib/nondet_bool.v
+iris_heap_lang/lib/lazy_coin.v
+iris_heap_lang/lib/clairvoyant_coin.v
+iris_heap_lang/lib/counter.v
+iris_heap_lang/lib/atomic_heap.v
+iris_heap_lang/lib/increment.v
+iris_heap_lang/lib/diverge.v
+iris_heap_lang/lib/arith.v
+iris_heap_lang/lib/array.v
+iris_heap_lang/lib/logatom_lock.v
+
+iris_unstable/algebra/list.v
+iris_unstable/base_logic/algebra.v
+iris_unstable/base_logic/mono_list.v
+iris_unstable/heap_lang/interpreter.v
+
+iris_deprecated/base_logic/auth.v
+iris_deprecated/base_logic/sts.v
+iris_deprecated/base_logic/viewshifts.v
+iris_deprecated/program_logic/hoare.v

awk.Makefile

-# awk program that patches the Makefile generated by Coq.
-
-# Detect the name this project will be installed under.
-/\$\(COQLIBINSTALL\)\/.*\/\$\$i/ {
-# Wow, POSIX awk is really broken.  I mean, isn't it supposed to be a text processing language?
-# And there is not even a way to access the matched groups of a regexp...?!? Lucky enough,
-# we can just split the string at '/' here.
-	split($0, PIECES, /\//);
-	PROJECT=PIECES[2];
-}
-
-# Patch the uninstall target to work properly, and to also uninstall stale files.
-# Also see <https://coq.inria.fr/bugs/show_bug.cgi?id=4907>.
-/^uninstall:/ {
-	print "uninstall:";
-	print "\tif [ -d \"$(DSTROOT)\"$(COQLIBINSTALL)/"PROJECT"/ ]; then find \"$(DSTROOT)\"$(COQLIBINSTALL)/"PROJECT"/ \\( -name \"*.vo\" -o -name \"*.v\" -o -name \"*.glob\" -o \\( -type d -empty \\) \\) -print -delete; fi";
-	getline;
-	next
-}
-
-# Patch vio2vo to (a) run "make quick" with the same number of jobs, ensuring
-# that the .vio files are up-to-date, and (b) only schedule vio2vo for those
-# files where the .vo is *older* than the .vio.
-/^vio2vo:/ {
-	print "vio2vo:";
-	print "\t@make -j $(J) quick"
-	print "\t@VIOFILES=$$(for file in $(VOFILES:%.vo=%.vio); do vofile=\"$$(echo \"$$file\" | sed \"s/\\.vio/.vo/\")\"; if [ \"$$vofile\" -ot \"$$file\" -o ! -e \"$$vofile\" ]; then echo -n \"$$file \"; fi; done); \\"
-	print "\t echo \"VIO2VO: $$VIOFILES\"; \\"
-	print "\t if [ -n \"$$VIOFILES\" ]; then $(COQC) $(COQDEBUG) $(COQFLAGS) -schedule-vio2vo $(J) $$VIOFILES; fi"
-	getline;
-	next
-}
-
-# This forwards all unchanged lines
-1

benchmark/.gitignore

-__pycache__
-build-times.log*
-gitlab-extract

benchmark/gitlab-extract.py

-#!/usr/bin/env python3
-import argparse, pprint, sys
-import requests
-import parse_log
-
-def last(it):
-    r = None
-    for i in it:
-        r = i
-    return r
-
-def first(it):
-    for i in it:
-        return i
-    return None
-
-def req(path):
-    url = '%s/api/v3/%s' % (args.server, path)
-    return requests.get(url, headers={'PRIVATE-TOKEN': args.private_token})
-
-# read command-line arguments
-parser = argparse.ArgumentParser(description='Extract iris-coq build logs from GitLab')
-parser.add_argument("-t", "--private-token",
-                    dest="private_token", required=True,
-                    help="The private token used to authenticate access.")
-parser.add_argument("-s", "--server",
-                    dest="server", default="https://gitlab.mpi-sws.org/",
-                    help="The GitLab server to contact.")
-parser.add_argument("-p", "--project",
-                    dest="project", default="FP/iris-coq",
-                    help="The name of the project on GitLab.")
-parser.add_argument("-f", "--file",
-                    dest="file", required=True,
-                    help="Filename to store the load in.")
-parser.add_argument("-c", "--commits",
-                    dest="commits",
-                    help="The commits to fetch. Default is everything since the most recent entry in the log file.")
-args = parser.parse_args()
-log_file = sys.stdout if args.file == "-" else open(args.file, "a")
-
-# determine commit, if missing
-if args.commits is None:
-    if args.file == "-":
-        raise Exception("If you do not give explicit commits, you have to give a logfile so that we can determine the missing commits.")
-    last_result = last(parse_log.parse(open(args.file, "r"), parse_times = False))
-    args.commits = "{}..origin/master".format(last_result.commit)
-
-projects = req("projects")
-project = first(filter(lambda p: p['path_with_namespace'] == args.project, projects.json()))
-if project is None:
-    sys.stderr.write("Project not found.\n")
-    sys.exit(1)
-
-BREAK = False
-for commit in parse_log.parse_git_commits(args.commits):
-    if BREAK:
-        break
-    print("Fetching {}...".format(commit))
-    commit_data = req("/projects/{}/repository/commits/{}".format(project['id'], commit))
-    if commit_data.status_code != 200:
-        raise Exception("Commit not found?")
-    builds = req("/projects/{}/repository/commits/{}/builds".format(project['id'], commit))
-    if builds.status_code != 200:
-        raise Exception("Build not found?")
-    # iterate over builds by decreasing ID, and look for the artifact
-    for build in builds.json():
-        if build['status'] in ('created', 'pending', 'running'):
-            # build still not yet done, don't fetch this or any later commit
-            BREAK = True
-            break
-        if build['status'] != 'success':
-            # build failed or cancelled, skip to next
-            continue
-        # now fetch the build times
-        build_times = requests.get("{}/builds/{}/artifacts/file/build-time.txt".format(project['web_url'], build['id']))
-        if build_times.status_code != 200:
-            # no artifact at this build, try another one
-            continue
-        # Output in the log file format
-        log_file.write("# {}\n".format(commit))
-        log_file.write(build_times.text)
-        log_file.flush()
-        # don't fetch another one
-        break

benchmark/parse_log.py

-import re, subprocess
-
-class Result:
-    def __init__(self, commit, times):
-        self.commit = commit
-        self.times = times
-
-def parse(file, parse_times = True):
-    '''[file] should be a file-like object, an iterator over the lines.
-       yields a list of Result objects.'''
-    commit_re = re.compile("^# ([a-z0-9]+)$")
-    time_re = re.compile("^([a-zA-Z0-9_/-]+) \(user: ([0-9.]+) mem: ([0-9]+) ko\)$")
-    commit = None
-    times = None
-    for line in file:
-        # next commit?
-        m = commit_re.match(line)
-        if m is not None:
-            # previous commit, if any, is done now
-            if commit is not None:
-                yield Result(commit, times)
-            # start recording next commit
-            commit = m.group(1)
-            if parse_times:
-                times = {} # reset the recorded times
-            continue
-        # next file time?
-        m = time_re.match(line)
-        if m is not None:
-            if times is not None:
-                name = m.group(1)
-                time = float(m.group(2))
-                times[name] = time
-            continue
-        # nothing else we know about, ignore
-    # end of file. previous commit, if any, is done now.
-    if commit is not None:
-        yield Result(commit, times)
-
-def parse_git_commits(commits):
-    '''Returns an iterable of SHA1s'''
-    if commits.find('..') >= 0:
-        # a range of commits
-        commits = subprocess.check_output(["git", "rev-list", commits])
-    else:
-        # a single commit
-        commits = subprocess.check_output(["git", "rev-parse", commits])
-    return reversed(commits.decode("utf-8").strip().split('\n'))

benchmark/visualize.py

-#!/usr/bin/env python3
-import argparse, sys, pprint, itertools
-import matplotlib.pyplot as plt
-import parse_log
-
-markers = itertools.cycle([(3, 0), (3, 0, 180), (4, 0), (4, 0, 45), (8, 0)])
-
-# read command-line arguments
-parser = argparse.ArgumentParser(description='Visualize iris-coq build times')
-parser.add_argument("-f", "--file",
-                    dest="file", required=True,
-                    help="Filename to get the data from.")
-parser.add_argument("-t", "--timings", nargs='+',
-                    dest="timings",
-                    help="The names of the Coq files (with or without the extension) whose timings should be extracted")
-parser.add_argument("-c", "--commits",
-                    dest="commits",
-                    help="Restrict the graph to the given commits.")
-args = parser.parse_args()
-pp = pprint.PrettyPrinter()
-log_file = sys.stdin if args.file == "-" else open(args.file, "r")
-
-results = parse_log.parse(log_file, parse_times = True)
-if args.commits:
-    commits = set(parse_log.parse_git_commits(args.commits))
-    results = filter(lambda r: r.commit in commits, results)
-results = list(results)
-
-timings = list(map(lambda t: t[:-2] if t.endswith(".v") else t, args.timings))
-for timing in timings:
-    plt.plot(list(map(lambda r: r.times.get(timing), results)), marker=next(markers), markersize=8)
-plt.legend(timings, loc = 'upper left', bbox_to_anchor=(1.05, 1.0))
-plt.xticks(range(len(results)), list(map(lambda r: r.commit[:7], results)), rotation=70)
-plt.subplots_adjust(bottom=0.2, right=0.7) # more space for the commit labels and legend
-
-plt.xlabel('Commit')
-plt.ylabel('Time (s)')
-plt.title('Time to compile files')
-plt.grid(True)
-plt.show()

build/opam-ci.sh

-#!/bin/bash
-set -e
-# This script installs the build dependencies for CI builds.
-
-# Prepare OPAM configuration
-export OPAMROOT="$(pwd)/opamroot"
-export OPAMJOBS="$((2*$CPU_CORES))"
-export OPAM_EDITOR="$(which false)"
-
-# Make sure we got a good OPAM
-test -d "$OPAMROOT" || (mkdir "$OPAMROOT" && opam init --no-setup -y)
-eval `opam conf env`
-if test $(find "$OPAMROOT/repo/package-index" -mtime +0); then
-    # last update was more than a day ago
-    opam update
-else
-    echo "[opam-ci] Not updating opam."
-fi
-test -d "$OPAMROOT/repo/coq-extra-dev" || opam repo add coq-extra-dev https://coq.inria.fr/opam/extra-dev -p 5
-test -d "$OPAMROOT/repo/coq-core-dev" || opam repo add coq-core-dev https://coq.inria.fr/opam/core-dev -p 5
-test -d "$OPAMROOT/repo/coq-released" || opam repo add coq-released https://coq.inria.fr/opam/released -p 10
-
-# Install fixed versions of some dependencies
-echo
-while (( "$#" )); do # while there are arguments left
-    PACKAGE="$1" ; shift
-    VERSION="$1" ; shift
-    # Check if the pin is already set
-    if opam pin list | fgrep "$PACKAGE.$VERSION " > /dev/null; then
-        echo "[opam-ci] $PACKAGE already pinned to $VERSION"
-    else
-        echo "[opam-ci] Pinning $PACKAGE to $VERSION"
-        opam pin add "$PACKAGE" "$VERSION" -k version -y
-    fi
-done
-
-# Install build-dependencies
-echo
-make build-dep Y=1
-
-# done
-echo
-coqc -v