Handling Context Dependencies
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   The Bison paradigm is to parse tokens first, then group them into
larger syntactic units.  In many languages, the meaning of a token is
affected by its context.  Although this violates the Bison paradigm,
certain techniques (known as "kludges") may enable you to write Bison
parsers for such languages.

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Semantic Tokens

Token parsing can depend on the semantic context.

Lexical Tie-ins

Token parsing can depend on the syntactic context.

Tie-in Recovery

Lexical tie-ins have implications for how error recovery rules must be written. (Actually, "kludge" means any technique that gets its job done but is

neither clean nor robust.)