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Commit 002cb824 authored by Robbert Krebbers's avatar Robbert Krebbers
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Type annotation in potential ambigious case.

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......@@ -190,7 +190,7 @@ Qed.
Lemma subst_map_empty e : subst_map e = e.
Proof.
assert ( x, binder_delete x (∅:gmap _ val) = ) as Hdel.
assert ( x, binder_delete x (∅:gmap string val) = ) as Hdel.
{ intros [|x]; by rewrite /= ?delete_empty. }
induction e; simplify_map_eq; rewrite ?Hdel; auto with f_equal.
Qed.
......
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