Improve faulty parsing of assigments #12815
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Add a specific handling on the parser when a lone
:=is found. It produces instances of a new specific class RBAssignmentErrorNode.Bad left values, like in
a foo := 5are likely to be consumed as unfinished statements (likea foo.), then the:=that follows (and the right value) consumed as distinct statements of assignment errors (like:= 5). Thus, producing an acceptable faulty AST.A possible alternative faulty AST could be to include the unfinished left value as a child of the RBAssignmentErrorNode.
But this requires to hack the parser more (for not that much additional value)