Doug Gregor 61ac2534e7 [Type checker] Make coercePatternToType return the new Pattern. ...

Rather than mutating the parameter pattern in place and separately
return whether an error occurred, return the new pattern or NULL if an
error occurred. While here, switch over to ContextualPattern for the
input.

And get rid of that infernal "goto".

2020-01-03 17:27:55 -08:00

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