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2 changes: 1 addition & 1 deletion theories/Lists/ListDec.v
Original file line number Diff line number Diff line change
Expand Up @@ -65,7 +65,7 @@ Qed.

Lemma NoDup_list_decidable (l:list A) : NoDup l -> forall x y:A, In x l -> In y l -> decidable (x=y).
Proof using A.
clear dec; intros Hl; induction Hl; firstorder congruence.
try clear dec; intros Hl; induction Hl; firstorder congruence.
Qed.

End Dec_in_Prop.
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