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+(* Dependent higher-order hole in "refine" (simplified version) *)
+
+Set Implicit Arguments.
+
+Inductive Nest t := Cons : Nest (prod t t) -> Nest t.
+
+Definition cast A x y Heq P H := @eq_rect A x P H y Heq.
+
+Definition replace a (y:Nest (prod a a)) : a = a -> Nest a.
+
+(* This used to raise an anomaly Unknown Meta in 8.2 and 8.3beta.
+   It raises a regular error in 8.3 and almost succeeds with the new
+   proof engine: there are two solutions to a unification problem
+   (P:=\a.Nest (prod a a) and P:=\_.Nest (prod a a)) and refine should either
+   leave P as subgoal or choose itself one solution *)
+
+intros. refine (Cons (cast H _ y)).