Imported Upstream version 8.5~beta1+dfsg

1 files changed, 24 insertions, 0 deletions

diff --git a/test-suite/bugs/closed/2139.v b/test-suite/bugs/closed/2139.v
new file mode 100644
index 00000000..a7f35508
--- /dev/null
+++ b/test-suite/bugs/closed/2139.v
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+(* Call of apply on <-> failed because of evars in elimination predicate *)
+Generalizable Variables patch.
+
+Class Patch (patch : Type) := {
+    commute : patch -> patch -> Prop
+}.
+
+Parameter flip : forall	`{patchInstance	: Patch	patch}
+                       	 {a b : patch},
+                 commute a b <-> commute b a.
+
+Lemma Foo : forall `{patchInstance : Patch patch}
+                    {a b : patch},
+            (commute a b)
+         -> True.
+Proof.
+intros.
+apply flip in H.
+
+(* failed in well-formed arity check because elimination predicate of
+   iff in (@flip _ _ _ _) had normalized evars while the ones in the
+   type of (@flip _ _ _ _) itself had non-normalized evars *)
+
+(* By the way, is the check necessary ? *)