[swift-evolution] [Pitch] Make the first parameter in a function declaration follow the same rules as the others

[Radosław Pietruszewski]

Looking at my code, the majority of methods should still have the first parameter unlabeled. 

I like the consistency of what you’re proposing and the fact that I don’t have to write `func foo(someArgument someArgument: T)` anymore. But I also fear people won’t get it that they can (and in many, probably most, situations should) make the first parameter `_ foo`.

— Radek

> On 09 Mar 2016, at 19:58, Joe Groff via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Our accepted naming guidelines have embraced first argument labels for functions and methods. This weakens our justification for making the first parameter declaration in a `func` declaration behave differently from the others, implicitly being unlabeled. It seems pretty clear to me we should make all of the parameter declarations behave uniformly:
> 
> func foo(x: Int, y: Int) // Should declare foo(x:y:), instead of foo(_:y:)
> func foo(_ x: Int, y: Int) // Explicitly declares foo(_:y:)
> 
> This would also make `init` and `func` parameters behave consistently, which is nice. There may still be hope for our keyword argument rules to one day be shorter than the Smalltalk spec…
> 
> -Joe
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