Commit f5a3065b authored by Robbert Krebbers's avatar Robbert Krebbers

Make `iEval` more robust by using a let binding internally.

This is to make sure that e.g. `//` in `iEval (rewrite .. // ..)` does
not immediately close the goal by reflexivity.
parent cd4706e8
......@@ -6,18 +6,20 @@ Set Default Proof Using "Type".
Import uPred.
Lemma tac_wp_expr_eval `{heapG Σ} Δ s E Φ e e' :
e = e'
( (e'':=e'), e = e'')
envs_entails Δ (WP e' @ s; E {{ Φ }}) envs_entails Δ (WP e @ s; E {{ Φ }}).
Proof. by intros ->. Qed.
Lemma tac_twp_expr_eval `{heapG Σ} Δ s E Φ e e' :
e = e'
( (e'':=e'), e = e'')
envs_entails Δ (WP e' @ s; E [{ Φ }]) envs_entails Δ (WP e @ s; E [{ Φ }]).
Proof. by intros ->. Qed.
Tactic Notation "wp_expr_eval" tactic(t) :=
try iStartProof;
try (first [eapply tac_wp_expr_eval|eapply tac_twp_expr_eval];
[t; reflexivity|]).
try (
iStartProof;
first [eapply tac_wp_expr_eval|eapply tac_twp_expr_eval];
[let x := fresh in intros x; t; unfold x; reflexivity
|]).
Ltac wp_expr_simpl := wp_expr_eval simpl.
Ltac wp_expr_simpl_subst := wp_expr_eval simpl_subst.
......
......@@ -414,13 +414,15 @@ Qed.
(** * Basic rules *)
Lemma tac_eval Δ Q Q' :
(Q' Q)
( (Q'':=Q'), Q'' Q) (* We introduce [Q''] as a let binding so that
tactics like `reflexivity` as called by [rewrite //] do not eagerly unify
it with [Q]. See [test_iEval] in [tests/proofmode]. *)
envs_entails Δ Q' envs_entails Δ Q.
Proof. by intros <-. Qed.
Lemma tac_eval_in Δ Δ' i p P P' Q :
envs_lookup i Δ = Some (p, P)
(P P')
( (P'':=P'), P P')
envs_simple_replace i p (Esnoc Enil i P') Δ = Some Δ'
envs_entails Δ' Q envs_entails Δ Q.
Proof.
......
......@@ -83,13 +83,14 @@ Ltac iStartProof :=
(** * Simplification *)
Tactic Notation "iEval" tactic(t) :=
iStartProof;
eapply tac_eval; [t; reflexivity|].
eapply tac_eval;
[let x := fresh in intros x; t; unfold x; reflexivity|].
Tactic Notation "iEval" tactic(t) "in" constr(H) :=
iStartProof;
eapply tac_eval_in with _ H _ _ _;
[env_reflexivity || fail "iEval:" H "not found"
|t; reflexivity
|let x := fresh in intros x; t; unfold x; reflexivity
|env_reflexivity
|].
......
......@@ -285,6 +285,13 @@ Proof. iIntros "H". iNext. by iNext. Qed.
Lemma test_iNext_laterN_laterN P n1 n2 : ^n1 ^n2 P ^n1 ^n2 P.
Proof. iIntros "H". iNext. iNext. by iNext. Qed.
Lemma test_iEval x y : (y + x)%nat = 1 - S (x + y) = 2%nat : uPred M.
Proof.
iIntros (H).
iEval (rewrite (Nat.add_comm x y) // H).
done.
Qed.
(* TODO: This test is broken in Coq 8.6. Should be restored once we drop Coq
8.6 support. See also issue #108. *)
(*
......
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