Doug Gregor c8dd8d0661 Implement SE-0001: Allow (most) keywords as argument labels. ...

Allow all keywords except for parameter introducers (var/let/inout) to
be argument labels when declaring or calling a
function/initializer/subscript, e.g., this

  func touchesMatching(phase: NSTouchPhase, `in` view: NSView?) -> Set<NSTouch>

can now be expressed as

  func touchesMatching(phase: NSTouchPhase, in view: NSView?) -> Set<NSTouch>

and the call goes from

  event.touchesMatching(phase, `in`: view)

to

  event.touchesMatching(phase, in: view)

Fixes [SR-344](https://bugs.swift.org/browse/SR-344) /
rdar://problem/22415674.

2015-12-22 16:18:28 -08:00

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