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+Set Implicit Arguments.
+Set Universe Polymorphism.
+Generalizable All Variables.
+
+Record Category (obj : Type) := { Morphism : obj -> obj -> Type }.
+
+Definition SetCat : @Category Set := @Build_Category Set (fun s d => s -> d).
+
+Record Foo := { foo : forall A (f : Morphism SetCat A A), True }.
+
+Local Notation PartialBuild_Foo pf := (@Build_Foo (fun A f => pf A f)).
+
+Set Printing Universes.
+Let SetCatFoo' : Foo.
+ let pf := fresh in
+ let pfT := fresh in
+ evar (pfT : Prop);
+ cut pfT;
+ [ subst pfT; intro pf;
+ let t := constr:(PartialBuild_Foo pf) in
+ let t' := (eval simpl in t) in
+ exact t'
+ | ].
+ admit.
+(* Toplevel input, characters 15-20:
+Error: Universe inconsistency (cannot enforce Set <= Prop).
+ *)