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The recent discussion about parser performance for CTAX has bought to mind something that was suggested a few months ago for I think autogen. Rather than writing the whole parser/lexer in scheme, why not use the standard free tools (flex/bison or lex/yacc), but have it emit guile code that uses say the gh_ interface. Surely the startup and runtime performance will be better. Furthermore, it should ease code re-use, at least for those languages which have an existing parser written this way; only the code generation would need to be changed. The main difficulty that I can see is that flex generates code that is not re-entrant; it might be hard to mix several translators Julian Satchell <satchell@dera.gov.uk>