- Have DiagnosticEngine produce "aka" annotations for sugared types.
- Fix the "optional type '@lvalue C?' cannot be used as a boolean; test for '!= nil' instead"
diagnostic to stop printing @lvalue noise.
This addresses:
<rdar://problem/19036351> QoI: Print minimally-desugared 'aka' types like Clang does
Swift SVN r30587
This is usually a more helpful type than our alternative, 'NSObject', although
it's not Equatable or Hashable. Since pretty much everything from Objective-C
inherits from NSObject, though, keeping the protocol qualifiers is much more
useful from a type-safety perspective.
The particular benefit for this comes with a change to libdispatch's <os/object.h>:
with dispatch types all declaring that they inherit from NSObjectProtocol, the
canonical form of the imported 'dispatch_queue_t' is now just a simple protocol
reference. That's type-safe as above, but is also a type that can be extended.
rdar://problem/16213421
Swift SVN r30100
