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Commit 272535e4 authored by Robbert Krebbers's avatar Robbert Krebbers
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Better error message for iAlways.

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theories/proofmode/tactics.v
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......@@ -778,7 +778,8 @@ Local Tactic Notation "iExistDestruct" constr(H)
(** * Always *)
Tactic Notation "iAlways":=
iStartProof;
apply tac_always_intro; env_cbv.
apply tac_always_intro; env_cbv
|| fail "iAlways: the goal is not an always modality".
(** * Later *)
Tactic Notation "iNext" open_constr(n) :=
......
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