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- NO_SUCH_RULE_IN_SCOPE
- LABEL_CONFLICTS_WITH_RULE_SCOPE_ATTRIBUTE
- LABEL_CONFLICTS_WITH_RULE_ARG_RETVAL
- TOKEN_ALIAS_CONFLICT (In combined only. Need to compare tokens def in combined with lexer rule in implicit lexer
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- TOKEN_ALIAS_CONFLICT)
syntax related
These need tree pattern matching to find subtrees with the right syntax. They need to check what's on the left-hand side of rewrites, so I also need to track a list of references within each alternative.
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