syntax-case
     
         a macro system for scheme by r. kent dybvig
        .  it is superior to the low-level system
        described in the revised^4 report r4rs.  pattern variables
        are ordinary identifiers with essentially the same status as
        lexical variable names and macro keywords.  the syntax
        is modified to recognise and handle references to pattern
        variables.  version 2.1 works with chez scheme and the
        macintosh port runs under macgambit 2.0
     
        ftp://iuvax.cs.indiana.edu/pub/scheme/syntax-case.tar.z.
        macintosh ftp://maya.dei.unipd.it/pub/mac/gambit/.
     
        "syntactic abstraction in scheme",
        robert hieb, r. kent dybvig and carl bruggeman
        iucs tr 355, 6/92 revised 7/3/92.
     
        "writing hygienic macros in scheme with syntax-case", r. kent
        dybvig, iucs tr 356, 6/92 revised 7/3/92.
     
        1992-07-06
     
     
see also:
macro scheme r4rs keywords syntax chez scheme 
macintosh macgambit lt;ftp://iuvax.cs.indiana.edu/pub/scheme/syntax-case.tar.zgt; lt;macintoshgt;