引数のタプル受け取りはジェネリクス使った関数だとNG

FunctionAttr.swift

/// Xcode7 beta4

struct MyInt {
    var a: Int
}

struct MyGenerics<T> {
    var a: T
}

func func1(a: MyInt, _ b: Int) {}
func func2(a: MyGenerics<Int>, _ b: Int) {}
func func3<T>(a: MyGenerics<T>, _ b: Int) {}

let t1: (MyInt, Int) = (MyInt(a: 0), 0)
let t2: (MyGenerics<Int>, Int) = (MyGenerics(a: 0), 0)

func1(t1)   // OK
func2(t2)   // OK
func3(t2)   // NG

let func4: (MyGenerics<Int>, Int) -> () = func3
func4(t2)   // OK