Alex Crichton 9c330529f2
Fix codegen for descriptors of async fn returns (#1782)
They erroneously reported returning the original return type, not the
promise! Let's also add a bunch of positive tests while we're at it.

Closes #1781
2019-09-20 16:06:27 -05:00
..
2018-09-26 08:26:00 -07:00
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2018-09-26 08:26:00 -07:00
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