Alex Hoppen d2e045c8b5 Implement SE-0064 / SR-1239: #selector for property getters and setters ...

Implements the core functionality of SE-0064 / SR-1239, which
introduces support for accessing the Objective-C selectors of the
getter and setter of an @objc property via #selector(getter:
propertyName) and #selector(setter: propertyName).

Introduce a bunch of QoI around mistakes using #selector to refer to a
property without the "getter:" or "setter:", using Fix-Its to help the
user get it right. There is more to do in this area, still, but we
have an end-to-end feature working.

Much of the implementation and nearly all of the test cases are from
Alex Hoppen (@ahoppen). I've done a bit of refactoring, simplified the
AST representation, and replaced Alex's custom
expression-to-declaration logic with an extension to the constraint
solver. The last bit might be short-lived, based on swift-evolution
PR280, which narrows the syntax of #selector considerably.

2016-05-11 16:51:27 -07:00

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