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Require Import A.
Definition y := x.
Lemma yeq : y = y.
Proof. pose xeq. auto. Qed.
Section Foo.
Variable (HFalse : False).
Lemma yeq' : y = y.
Proof using HFalse. elimtype False. apply HFalse. Qed.
End Foo.
Module Type E. End E.
Module M.
Lemma x : True.
Proof. trivial. Qed.
End M.
Module Type T.
Lemma x : True.
Proof. trivial. Qed.
End T.
Module F(X:E).
Lemma x : True.
Proof. trivial. Qed.
End F.
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