Chris,

The proposed syntax looks and reads so much better! +1.

On 15 April 2016 at 05:57, Chris Lattner via swift-evolution
<swift-evolution@swift.org> wrote:
> We currently accept function type syntax without parentheses, like:
>
>   Int -> Float
>   String -> ()
>
> etc.  The original rationale aligned with the fact that we wanted to treat 
> all functions as taking a single parameter (which was often of tuple type) 
> and producing a tuple value (which was sometimes a tuple, in the case of void 
> and multiple return values).  However, we’ve long since moved on from that 
> early design point: there are a number of things that you can only do in a 
> parameter list now (varargs, default args, etc), implicit tuple splat has 
> been removed, and  the compiler has long ago stopped modeling function 
> parameters this way.  Beyond that, it eliminates one potential style war.
>
> Given all this, I think it makes sense to go for syntactic uniformity between 
> parameter list and function types, and just require parenthesis on the 
> argument list.  The types above can be trivially written as:
>
>   (Int) -> Float
>   (String) -> ()
>
> Thoughts?
>
> -Chris
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