Mark Lacey 3ba204694e Do not suppress optional coercion in operators with a nil-literal operand. ...

This is the hack that has been used to reject things like:
  var i: Int = ...
  if i == nil { }
in the past.

The hack is inconsistent with normal treatment of mixed optional &
non-optional operands, and will be replaced with a warning instead of
treating it as a failure to type check.

There is still a case that we still fail type checking on -
Unsafe*Pointer<> compares to nil. That will be addressed by a separate
commit.

The new warning will be addressed by rdar://problem/27457457. When the
new warnings are updated the test cases modified here will again need to
be updated based on the text of the new warning.

2016-07-21 22:39:33 -07:00

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