[swift-evolution] [Proposal] Automating Partial Application via Wildcards

[Chris Lattner]

> On Feb 2, 2016, at 9:33 AM, Erica Sadun via swift-evolution <swift-evolution at swift.org> wrote:
> 
> When called with wildcard tokens, the function is partially applied using the supplied arguments. For example:
> 
> let partial1 = projectFunctionToCoordinateSystem(function: mySinFunction, p0: p0, p1: p1, x: _)
> // partial1(x: xValue)

One superficial comment on this: the use of _ here is a bad idea.  _ already means something in expressions - “discard”, and a closely related thing in declarations - “ignore”.  

Adding a third very different thing (placeholder to be filled in later) seems like a really confusing thing to do.

-Chris

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