// RUN: %swift -i %s | FileCheck %s

// <rdar://problem/13995785> We were using the wrong type metadata pointer for the empty
// tuple.

func dup<T>(x:T) -> (T, T) {
  return (x, x)
}

func drop<T>(x:T) {}

var x = ()
drop(dup(x))
println("ok") // CHECK: ok