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+(* Don't do zeta in cbn when not asked for *)
+
+Goal let x := 0 in
+     let y := x in
+     y = 0.
+  (* We use "cofix" as an example because there are obviously no
+     cofixpoints in sight.  This problem arises with any set of
+     reduction flags (not including zeta where the lets are of course reduced away) *)
+  cbn cofix.
+  intro x.
+  unfold x at 1. (* Should succeed *)
+  Undo 2.
+  cbn zeta.
+  Fail unfold x at 1.
+Abort.