[swift-evolution] Infer types of default function parameters

[David Sweeris]

> On Mar 10, 2017, at 1:40 PM, Kilian Koeltzsch via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Hi all,
> 
> I sent the message below to swift-users@ ~a day ago, but this might be a better place to ask and gather some discussion. It is a rather minor suggestion and I'm just looking for some opinions.
> 
> Declaring a function that has default parameters currently looks like this:
> 
> func foo(bar: String = "baz") {
>     print(bar)
> }
> 
> Now I'm wondering if there would be any problems if it were possible to omit the type annotation for default params and let Swift's type inference handle that. 
> 
> func foo(bar = "baz") {
>     print(bar)
> }
> 
> It feels to be equivalent to omitting type annotations with variable declarations. Obviously more complex types would still require annotations being specified. Off the top of my head I can't think of any negative ramifications this might bring, be it in simple function/method declarations or protocol extensions and elsewhere. 
> Any further input or examples for situations where this might cause issues would be much appreciated :)

Tentatively +1… I still haven’t thought through it as much as I’d like to.

- Dave Sweeris
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