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+Set Universe Polymorphism.
+
+Record Type_Over (X : Type)
+:= { Domain :> Type;
+ proj : Domain -> X }.
+
+Definition Self_Over (X : Type)
+ := {| Domain := X; proj := (fun x => x) |}.
+
+Canonical Structure Self_Over. (* fails with Anomaly: Mismatched instance and context when building universe substitution. Please report. for polymorphic structures *)
+(* if monomorphic, Warning: No global reference exists for projection
+ valuefun x : _UNBOUND_REL_1 => x in instance Self_Over of proj, ignoring it. *)