Issue 341 - #11
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Summary
resolves Instagram#341
Adds
_PrecedenceNodeas a helper class to automatically parenthesize child nodes when necessaryTest Plan
Adds basic unit tests for implicit parens and extends fuzz testing.
Notes
I had originally tried to allow
MaybeSentinelin{l,r}parattrs but this proved difficulty to get right. It would require numerous changes to the parser to ensure proper construction of_BaseParenthesizableNodeas they are often explicitly constructed with emptylparandrparattributes.