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package test
class X1
class X2
class X3
trait One[A]
trait Two[A, B]
class Foo extends Two[X1, X2] with One[X3]
object Test {
def test1[M[_], A](x: M[A]): M[A] = x
val foo = new Foo
test1(foo): One[X3] // fails with -Ypartial-unification enabled
test1(foo): Two[X1, X2] // fails without -Ypartial-unification
}
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