Andy 79b9fa51b6 Avoid infinite loop checking yield expression (#21728)
* Avoid infinite loop checking yield expression

* Revert now-unneeded change

* Revert test filename changes
2018-11-19 11:18:32 -08:00
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2018-10-24 13:51:24 -07:00
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2018-11-19 10:54:54 -08:00