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class Test {
def foo[A](x: A)(implicit rep: Foo[A]): Foo[A] = rep
abstract class Foo[A]
implicit def list2Foo[List[A1], A2]
(implicit _1: Foo[List[A1]], _2: Foo[A2]): Foo[Tuple2[List[A1], A2]] =
null //dummy
foo(((List('b'), 3), (Nil, 4)))
}
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