Mike Ash 0dae9b3dc0 [Runtime] Have swift_dynamicCast unwrap multiple levels of optionals in the source. ...

The real work is done in checkDynamicCastFromOptional. This code tried to unwrap the source and returned the payload on success. It only did this once, so a type like Optional<Optional<Int>> would come out as Optional<Int> and then a cast to Int would fail.

This change makes checkDynamicCastFromOptional recursive, which makes it unwrap as many levels of Optional as it encounters.

Fixes rdar://problem/40171034 and SR-7664.

2018-05-22 15:05:09 -04:00

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