Fix bug #5377: @? patterns broken.

1 files changed, 54 insertions, 0 deletions

diff --git a/test-suite/bugs/closed/5377.v b/test-suite/bugs/closed/5377.v
new file mode 100644
index 000000000..130d9f9ab
--- /dev/null
+++ b/test-suite/bugs/closed/5377.v
@@ -0,0 +1,54 @@
+Goal ((forall (t : Type) (x y : t),
+          True ->
+          x = y)) -> False.
+Proof.
+  intro HG.
+  let P := lazymatch goal with
+  | [ H : forall t x y, True -> @?P t x y
+                        |- _ ]
+    => P
+  end in
+  pose (f := P).
+  unify f (fun (t : Type) (x y : t) => x = y).
+Abort.
+
+Goal True.
+Proof.
+let c := lazymatch constr:(fun (T : nat -> Type) (y : nat) (_ : T y) => y) with
+         | fun _ y _ => @?C y => C
+         end in
+pose (f := c).
+unify f (fun n : nat => n).
+Abort.
+
+Goal (forall x : nat, x = x -> x = x \/ x = x) -> True.
+Proof.
+intro.
+let P := lazymatch goal with
+| [ H : forall y, @?P y -> @?P y \/ _ |- _ ]
+  => P
+end in
+pose (f := P).
+unify f (fun x : nat => x = x).
+Abort.
+
+Goal (forall x : nat, x = x -> x = x \/ x = x) -> True.
+Proof.
+intro.
+lazymatch goal with
+| [ H : forall y, @?P y -> @?Q y \/ _ |- _ ]
+  => idtac
+end.
+Abort.
+
+Axiom eq : forall {T} (_ : T), Prop.
+
+Goal forall _ : (forall t (_ : eq t) (x : t), eq x), Prop.
+Proof.
+intro.
+let P := lazymatch goal with
+| [ H : forall t _ x, @?P t x |- _ ]
+  => P
+end in
+pose (f := P).
+Abort.