File: bug_4480.v

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Require Import Setoid.

Definition proj (P Q : Prop) := P.

Lemma foo (P : Prop) : proj P P = P.
Admitted.
Lemma trueI : True <-> True.
Admitted.
Goal True.
  Fail setoid_rewrite foo.
  Fail setoid_rewrite trueI.
Abort.