Imported Upstream snapshot 8.3~beta0+13298

1 files changed, 27 insertions, 0 deletions

diff --git a/test-suite/bugs/closed/shouldsucceed/1416.v b/test-suite/bugs/closed/shouldsucceed/1416.v
new file mode 100644
index 00000000..da67d9b0
--- /dev/null
+++ b/test-suite/bugs/closed/shouldsucceed/1416.v
@@ -0,0 +1,27 @@
+Set Implicit Arguments.
+
+Record Place (Env A: Type) : Type := {
+  read: Env -> A ;
+  write: Env -> A -> Env ;
+  write_read: forall (e:Env), (write e (read e))=e
+}.
+
+Hint Rewrite -> write_read: placeeq.
+
+Record sumPl (Env A B: Type) (vL:(Place Env A)) (vR:(Place Env B)) : Type :=
+ {
+   mkEnv: A -> B -> Env ;
+   mkEnv2writeL: forall (e:Env) (x:A), (mkEnv x (read vR e))=(write vL e x)
+ }.
+
+(* when the following line is commented, the bug does not appear *)
+Hint Rewrite -> mkEnv2writeL: placeeq.
+
+Lemma autorewrite_raise_anomaly: forall (Env A:Type) (e: Env) (p:Place Env A),
+  (exists e1:Env, e=(write p e1 (read p e))).
+Proof.
+  intros Env A e p; eapply ex_intro.
+  autorewrite with placeeq. (* Here is the bug *)
+  auto.
+Qed.
+