Imported Upstream version 8.5~beta1+dfsg

1 files changed, 30 insertions, 0 deletions

diff --git a/test-suite/bugs/closed/1416.v b/test-suite/bugs/closed/1416.v
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index 00000000..ee092005
--- /dev/null
+++ b/test-suite/bugs/closed/1416.v
@@ -0,0 +1,30 @@
+(* In 8.1 autorewrite used to raised an anomaly here *)
+(* After resolution of the bug, autorewrite succeeded *)
+(* From forthcoming 8.4, autorewrite is forbidden to instantiate *)
+(* evars, so the new test just checks it is not an anomaly *)
+
+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 *)
+