Fix #302: Keep internal token types out of lexer #303
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Haskell: prevent internal user token types to become part of the lexer. TODO: exclude them also from being mentioned in the parser (currently broken). Lexer and Parser should share a common functionality that makes sure they do not get out of sync.
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[ WIP #302 ] isUsedCat distinguishes between Internal and Parsable
Haskell: prevent internal user token types to become part of the lexer.
TODO: exclude them also from being mentioned in the parser (currently
broken).
Lexer and Parser should share a common functionality that makes sure
they do not get out of sync.