From 38ff8d2b59a481ba489400ea194fdd78c6c2d5e1 Mon Sep 17 00:00:00 2001
From: msozeau
Date: Mon, 19 Mar 2007 16:54:25 +0000
Subject: Add a parameter to QuestionMark evar kind to say it can be turned
 into an obligations (even an opaque one). Change cast_type to include the
 converted-to type or nothing in case of a Coerce cast, required much minor
 changes. Various little subtac changes.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@9718 85f007b7-540e-0410-9357-904b9bb8a0f7
---
 contrib/subtac/FunctionalExtensionality.v | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'contrib/subtac/FunctionalExtensionality.v')

diff --git a/contrib/subtac/FunctionalExtensionality.v b/contrib/subtac/FunctionalExtensionality.v
index 07a19ab376..4610f3467a 100644
--- a/contrib/subtac/FunctionalExtensionality.v
+++ b/contrib/subtac/FunctionalExtensionality.v
@@ -1,3 +1,11 @@
+Lemma equal_f : forall A B : Type, forall (f g : A -> B), 
+  f = g -> forall x, f x = g x.
+Proof.
+  intros.
+  rewrite H.
+  auto.
+Qed.
+
 Axiom fun_extensionality : forall A B (f g : A -> B), 
   (forall x, f x = g x) -> f = g.
 
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