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+(* File reduced by coq-bug-finder from original input, then from 5449 lines to 44 lines *)
+(* coqc version trunk (September 2014) compiled on Sep 25 2014 2:53:46 with OCaml 4.01.0
+   coqtop version trunk (September 2014) *)
+Set Primitive Projections.
+
+Axiom IsHSet : Type -> Type.
+Record hSet := BuildhSet {setT:> Type; iss :> IsHSet setT}.
+
+Module withdefault.
+Canonical Structure default_HSet := fun T P => (@BuildhSet T P).
+Goal forall (z : hSet) (T0 : Type -> Type),
+       (forall (A : Type) (P : T0 A -> Type) (aa : T0 A), P aa) ->
+       forall x0 : setT z, Set.
+  clear; intros z T H.
+  Set Debug Unification.
+  Fail refine (H _ _). (* Timeout! *)
+Abort.
+End withdefault.
+
+Module withnondefault.
+Variable T0 : Type -> Type.
+Variable T0hset: forall A, IsHSet (T0 A).
+
+Canonical Structure nondefault_HSet := fun A =>(@BuildhSet (T0 A) (T0hset A)).
+Canonical Structure default_HSet := fun A P =>(@BuildhSet A P).
+Goal forall (z : hSet) (T0 : Type -> Type),
+       (forall (A : Type) (P : T0 A -> Type) (aa : T0 A), P aa) ->
+       forall x0 : setT z, Set.
+  clear; intros z T H.
+  Set Debug Unification.
+  Fail refine (H _ _). (* Timeout! *)
+Abort.
+End withnondefault.