Open Radar

 
Summary:
Constructors are functions. Static functions are also functions. The difference is that the latter can be passed as the argument to map, but the former cannot.


Steps to Reproduce:
1. Try to run this code:
struct S {
	init(Int) {}
}
let f: Int -> S = S
let x: [S] = map([1, 2, 3], S.init)


Expected Results:
I expected this to compile, and for f or at least x to be successfully bound by those expressions.


Actual Results:
Both of them error: “expected member name or constructor call after type name” and “initializer cannot be referenced without arguments” respectively.


Regression:
The workaround is to construct an anonymous closure:

let x = map([1, 2, 3]) { S($0) }


Notes:
This makes for a proliferation of static functions or free functions constructing types which could otherwise just be using the extant initializers/constructors. I would much rather see:

map(array, Result) // or equivalently Result.init

than

map(array) { Result($0) }

More generally, improving Swift’s support for tacit programming[1] would be lovely ❤️

1: http://en.wikipedia.org/wiki/Tacit_programming