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(* TEST
expect;
*)
type ('a, 'b) eq = Refl : ('a, 'a) eq
type empty = (int, string) eq
let f = function `Foo (_ : empty) -> .
[%%expect{|
type ('a, 'b) eq = Refl : ('a, 'a) eq
type empty = (int, string) eq
val f : [< `Foo of empty ] -> 'a = <fun>
|}]
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