Commit c650b0ee authored by Robbert Krebbers's avatar Robbert Krebbers

Fix issue #181: let `wp_expr_eval` check that the goal is in fact a WP.

  Also, remove the inconsistency that `wp_expr_eval` succeeds on a goal
  that is not a WP.
parent be553c16
......@@ -15,11 +15,16 @@ Lemma tac_twp_expr_eval `{heapG Σ} Δ s E Φ e e' :
Proof. by intros ->. Qed.
Tactic Notation "wp_expr_eval" tactic(t) :=
try (
iStartProof;
first [eapply tac_wp_expr_eval|eapply tac_twp_expr_eval];
[let x := fresh in intros x; t; unfold x; reflexivity
|]).
lazymatch goal with
| |- envs_entails _ (wp ?s ?E ?e ?Q) =>
eapply tac_wp_expr_eval;
[let x := fresh in intros x; t; unfold x; reflexivity|]
| |- envs_entails _ (twp ?s ?E ?e ?Q) =>
eapply tac_twp_expr_eval;
[let x := fresh in intros x; t; unfold x; reflexivity|]
| _ => fail "wp_expr_eval: not a 'wp'"
end.
Ltac wp_expr_simpl := wp_expr_eval simpl.
Ltac wp_expr_simpl_subst := wp_expr_eval simpl_subst.
......@@ -293,13 +298,13 @@ Tactic Notation "wp_apply" open_constr(lem) :=
lazymatch goal with
| |- envs_entails _ (wp ?s ?E ?e ?Q) =>
reshape_expr e ltac:(fun K e' =>
wp_bind_core K; iApplyHyp H; try iNext; wp_expr_simpl) ||
wp_bind_core K; iApplyHyp H; try iNext; try wp_expr_simpl) ||
lazymatch iTypeOf H with
| Some (_,?P) => fail "wp_apply: cannot apply" P
end
| |- envs_entails _ (twp ?s ?E ?e ?Q) =>
reshape_expr e ltac:(fun K e' =>
twp_bind_core K; iApplyHyp H; wp_expr_simpl) ||
twp_bind_core K; iApplyHyp H; try wp_expr_simpl) ||
lazymatch iTypeOf H with
| Some (_,?P) => fail "wp_apply: cannot apply" P
end
......
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