Doug Gregor 87908c8a1b [Runtime] Handle tuple/tuple dynamic casts that add/remove labels. ...

Introduce narrow support for tuple/tuple dynamic casts that merely add
or remove labels, but require the element types to match exactly. This
gets us back to allowing the same correct dynamic casts as in Swift
3.0, when labels were completely ignored.

2016-09-20 17:05:07 -07:00

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