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+(* Testing 8.5 regression with type classes not solving evars 
+   redefined while trying to solve them with the type class mechanism *)
+
+Global Set Universe Polymorphism.
+Monomorphic Universe i.
+Inductive paths {A : Type} (a : A) : A -> Type :=
+  idpath : paths a a.
+Arguments idpath {A a} , [A] a.
+Notation "x = y :> A" := (@paths A x y) : type_scope.
+Notation "x = y" := (x = y :>_) : type_scope.
+
+Inductive trunc_index : Type :=
+| minus_two : trunc_index
+| trunc_S : trunc_index -> trunc_index.
+Notation "-1" := (trunc_S minus_two) (at level 0).
+
+Class IsPointed (A : Type) := point : A.
+Arguments point A {_}.
+
+Record pType :=
+  { pointed_type : Type ;
+    ispointed_type : IsPointed pointed_type }.
+Coercion pointed_type : pType >-> Sortclass.
+Existing Instance ispointed_type.
+
+Private Inductive Trunc (n : trunc_index) (A :Type) : Type :=
+  tr : A -> Trunc n A.
+Arguments tr {n A} a.
+
+
+
+Record ooGroup :=
+  { classifying_space : pType@{i} }.
+
+Definition group_loops (X : pType)
+: ooGroup.
+Proof.
+  (** This works: *)
+  pose (x0 := point X).
+  pose (H := existT (fun x:X => Trunc -1 (x = point X)) x0 (tr idpath)).
+  clear H x0.
+  (** But this doesn't: *)
+  pose (existT (fun x:X => Trunc -1 (x = point X)) (point X) (tr idpath)).