SE-0284: Allow Multiple Variadic Parameters in Functions, Subscripts, and Initializers

[owenv (Owen Voorhees)]

@Jon_Shier

How would this syntax interact with the new multi closure syntax and how would it impact the proposed parsing change ?

They're mostly orthogonal to each other, going from 1 variadic parameter to 2+ doesn't really affect how each individual variadic parameter interacts with the rest of the parameter list.

There was a brief discussion of this in the pitch thread:

@owenv

This proposal doesn't change the existing, post SE-0279 behavior of how multiple trailing closures interact with variadic closure parameters. There's some additional discussion of this and examples in SE-0279 and variadic parameters , but basically, trailing closures and variadic parameters don't work very well together due to the trailing closure argument matching rules requiring a backwards scan, and this proposal neither improves nor worsens the situation.

I haven't thoroughly reviewed Doug's implementation of the proposed forward scanning rule yet, but I think it's very unlikely this change will interfere with it.