Chris Lattner 60fc0e6cd2 Implement <rdar://problem/16951729> nil should be a literal type ...

This is all goodness, and eliminates a major source of implicit conversions.
One thing this regresses on though, is that we now reject "x == nil" where
x is an option type and the element of the optional is not Equtatable.  If
this is important, there are ways to enable this, but directly testing it as
a logic value is more straight-forward.

This does not include support for pattern matching against nil, that will be
a follow on patch.



Swift SVN r18918

2014-06-15 22:59:03 +00:00

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