Wesley Wigham 044cdbc85f Combine keyof T inferences (#22525)
* Combine keyof T inferences

* Extract covariant inference derivation into function

* Test:keyof inference lower priority than return inference

for #22376

* Update 'expected' comment in keyofInferenceLowerPriorityThanReturn

* Update comment in test too, not just baselines

* Fix typo

* Move tests
2018-03-19 17:59:06 -07:00
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