Is Implicit Tuple Splat behavior not fully removed?

xwu · December 19, 2020, 9:09pm

DandyLyons:

What I'm confused about is why does this work?
func call<I, O>(function: (I) -> O, params: I) -> O { return function(params)}
func sum(x:Int, y:Int, z:Int) -> Int {
    return x + y + z
}
let x = (1, 2, 3)
call(function: sum, params: x) //returns sum(x) which returns 6
Why does call(function: sum, params: x) compile but when I call sum(x) directly it doesn't compile?

You are correct: this behavior is an implicit splat and was removed.

However, this was found to cause an unacceptable usability regression, so an exception was made: