[swift-evolution] [pitch] Eliminate the "T1 -> T2" syntax, require "(T1) -> T2"

[Alan Skipp]

I’d place the ability to omit parenthesises for single args in the same category as being able to omit `self` when accessing properties. They are small conveniences that make a large difference to an entire codebase.

> On 19 Apr 2016, at 15:49, Erica Sadun via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Apart from intuition and confusion, parentheses are used at call sites
> and declarations. It seems out of line that they can be removed in types 
> but only in one degenerate case.
> 
> This goes against the Swift core design goal of consistency.
> 
> -- E

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