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Universes i.
Fail Constraint i < Set.
Fail Constraint i <= Set.
Fail Constraint i = Set.
Constraint Set <= i.
Constraint Set < i.
Fail Constraint i < j. (* undeclared j *)
Fail Constraint i < Type. (* anonymous *)
Set Universe Polymorphism.
Section Foo.
Universe j.
Constraint Set < j.
Definition foo := Type@{j}.
End Foo.
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