Update special cases for await / yield expression parsing #16213
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charlespierce
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This was referenced Jun 2, 2017
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Fixes #15943 and #15981
Updated special-case handling for
yieldexpressions outside of generators to parse string literals as yield expressions as well, allowing the type checker to produce a more useful error message in that case. Additionally, updated the special-case handling forawaitexpressions to use the same heuristics asyieldexpressions.