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

[Joe Groff]

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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