Joe Groff 4fdc20f739 Allow '<pattern> as T' checked patterns with subpattern bindings. ...

Allow a form of 'case is T' that matches the cast result to a subpattern, 'case <pattern> as T'. This exposes an issue in switch destructuring with casting into complex class hierarchies <rdar://problem/16401831> but works for common cases.

Swift SVN r15396

2014-03-24 00:02:44 +00:00

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