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omochimetaru 10/17/2017 7:00 AM
func f<X: Equatable>(x: X) {} f(x: ())
7:00 AM
error: TempGround.playground:3:6: error: argument type '()' does not conform to expected type 'Equatable' f(x: ()) ^
7:00 AM
ほんとだ。