File: bug_16880.v

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Polymorphic Axiom T@{u} : Prop.

Universe u1 u2.

Definition t1 := T@{u1}.
Definition t2 := T@{u2}.

Constraint u1 = u2.

Check fun P : t1 => P <: t2.
(* Error: In environment
P : t1
The term "P" has type "t1" while it is expected to have type "t2". *)