[swift-evolution] [Review] SE-0111: Remove type system significance of function argument labels
2th at gmx.de
Mon Jul 4 01:50:10 CDT 2016
I agree that labels should not affect the type, but imho the current status (Swift 2.3 — I haven't checked Version 3) is fine, and the proposal doesn't achieve what it says in the title:
For me, that is no question of types at all, but only of names:
var a: (Int, z: Int) -> Void = t
var b: (y: Int, z: Int) -> Void = t
a = b
This works, because a and b are both of type (Int, Int) -> Void, and the labels aren't significant.
So the proposal merely disallows labels in the declaration of function variables, which I consider bad, because labels convey the meaning of parameters. Why should something that is widely seen as a good feature of functions be removed from function variables?
If you share the opinion that labels are part of the name, the battleship example no good argument against labels:
No one stops you from doing
let minimum: (Int, Int) -> Int = max
Which is confusing as well.
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