1. 23 Jan, 2018 4 commits
  2. 19 Jan, 2018 1 commit
  3. 16 Jan, 2018 1 commit
    • Robbert Krebbers's avatar
      Special proof mode class for adding a modality to a goal. · a63f256e
      Robbert Krebbers authored
      This used to be done by using `ElimModal` in backwards direction. Having
      a separate type class for this gets rid of some hacks:
      
      - Both `Hint Mode`s in forward and backwards direction for `ElimModal`.
      - Weird type class precedence hacks to make sure the right instance is picked.
        These were needed because using `ElimModal` in backwards direction caused
        ambiguity.
      a63f256e
  4. 13 Jan, 2018 1 commit
  5. 12 Jan, 2018 1 commit
  6. 07 Jan, 2018 1 commit
  7. 31 Dec, 2017 1 commit
  8. 23 Dec, 2017 1 commit
  9. 21 Dec, 2017 1 commit
  10. 20 Dec, 2017 1 commit
  11. 14 Dec, 2017 1 commit
  12. 22 Nov, 2017 1 commit
  13. 14 Nov, 2017 1 commit
  14. 13 Nov, 2017 4 commits
    • Robbert Krebbers's avatar
      Remove spurious `iStartProof`. · 650261fc
      Robbert Krebbers authored
      650261fc
    • Robbert Krebbers's avatar
    • Robbert Krebbers's avatar
      Improved treatment of anonymous hypotheses in the proof mode. · bb3584e7
      Robbert Krebbers authored
      The proof mode now explicitly keeps track of anonymous hypotheses (i.e.
      hypotheses that are introduced by the introduction pattern `?`). Consider:
      
        Lemma foo {M} (P Q R : uPred M) : P -∗ (Q ∗ R) -∗ Q ∗ P.
        Proof. iIntros "? [H ?]". iFrame "H". iFrame. Qed.
      
      After the `iIntros`, the goal will be:
      
        _ : P
        "H" : Q
        _ : R
        --------------------------------------∗
        Q ∗ P
      
      Anonymous hypotheses are displayed in a special way (`_ : P`). An important
      property of the new anonymous hypotheses is that it is no longer possible to
      refer to them by name, whereas before, anonymous hypotheses were given some
      arbitrary fresh name (typically prefixed by `~`).
      
      Note tactics can still operate on these anonymous hypotheses. For example, both
      `iFrame` and `iAssumption`, as well as the symbolic execution tactics, will
      use them. The only thing that is not possible is to refer to them yourself,
      for example, in an introduction, specialization or selection pattern.
      
      Advantages of the new approach:
      
      - Proofs become more robust as one cannot accidentally refer to anonymous
        hypotheses by their fresh name.
      - Fresh name generation becomes considerably easier. Since anonymous hypotheses
        are internally represented by natural numbers (of type `N`), we can just fold
        over the hypotheses and take the max plus one. This thus solve issue #101.
      bb3584e7
    • Robbert Krebbers's avatar
  15. 06 Nov, 2017 1 commit
  16. 01 Nov, 2017 1 commit
    • Robbert Krebbers's avatar
      Hide the proof mode entailment behind a definition. · 8574d1ea
      Robbert Krebbers authored
      This solves issue #100: the proof mode notation is sometimes not printed. As
      Ralf discovered, the problem is that there are two overlapping notations:
      
      ```coq
      Notation "P ⊢ Q" := (uPred_entails P Q).
      ```
      
      And the "proof mode" notation:
      
      ```
      Notation "Γ '--------------------------------------' □ Δ '--------------------------------------' ∗ Q" :=
        (of_envs (Envs Γ Δ) ⊢ Q%I).
      ```
      
      These two notations overlap, so, when having a "proof mode" goal of the shape
      `of_envs (Envs Γ Δ) ⊢ Q%I`, how do we know which notation is Coq going to pick
      for pretty printing this goal? As we have seen, this choice depends on the
      import order (since both notations appear in different files), and as such, Coq
      sometimes (unintendedly) uses the first notation instead of the latter.
      
      The idea of this commit is to wrap `of_envs (Envs Γ Δ) ⊢ Q%I` into a definition
      so that there is no ambiguity for the pretty printer anymore.
      8574d1ea
  17. 28 Oct, 2017 1 commit
  18. 27 Oct, 2017 2 commits
  19. 26 Oct, 2017 1 commit
  20. 25 Oct, 2017 3 commits
  21. 05 Oct, 2017 1 commit
  22. 28 Sep, 2017 1 commit
  23. 27 Sep, 2017 1 commit
  24. 26 Sep, 2017 2 commits
    • Robbert Krebbers's avatar
      Fix issue #97. · b0ae1102
      Robbert Krebbers authored
      b0ae1102
    • Robbert Krebbers's avatar
      Fix issue #98. · e17ac4ad
      Robbert Krebbers authored
      We used to normalize the goal, and then checked whether it was of
      a certain shape. Since `uPred_valid P` normalized to `True ⊢ P`,
      there was no way of making a distinction between the two, hence
      `True ⊢ P` was treated as `uPred_valid P`.
      
      In this commit, I use type classes to check whether the goal is of
      a certain shape. Since we declared `uPred_valid` as `Typeclasses
      Opaque`, we can now make a distinction between `True ⊢ P` and
      `uPred_valid P`.
      e17ac4ad
  25. 21 Sep, 2017 1 commit
  26. 28 Aug, 2017 4 commits
  27. 24 Aug, 2017 1 commit