SCHEME STANDARDS PROPOSALS
                                       
   Proposed changes and additions to the Scheme standards are kept in
   this area.

     * A proposed module system by Matthias Blume (blume-mod.ps.gz).
     * Jonathan Rees' The Scheme of Things column on implementing
       lexically-scoped macros (macro-impl.ps.gz).
     * The LaTeX source for Will Clinger and Jonathan Rees' Macros That
       Work paper (macros_that_work.tex.gz).
     * Chris Hanson's description of the syntactic closures low-level
       macro facility, A Syntactic Closures Macro Facility
       (synclo.ps.gz), from Lisp Pointers IV(4), 9-16, December 1991.
       It is also available as an info file (synclo-info.tar.gz). An
       implementation is available, as well (../../code/lang/synclo.tar.gz).
     * R. Kent Dybvig's description of the syntax case macro system
       (syntax-case.ps.gz). A portable implementation is also
       available (../../code/lang/syntax-case.tar.gz).
     * Two papers from Will Clinger: Hygienic Macros Through Explicit
       Renaming, (exrename.ps.gz) from Lisp Pointers IV(4), 17-23,
       December 1991, and Macros in Scheme, (macinsch.ps.gz) from Lisp
       Pointers IV(4), 25-28, December 1991. The LaTeX source is
       available as well (willc.tar.gz).
     * A proposal for non-generic arithmetic procedures, by Thomas
       Breuel (non-generic.txt).
     * Pavel Curtis' The Scheme of Things column describing proposed
       facilities for programmer-defined data types and for multiple
       return values (records-mvalues.ps.gz).
     * Several implementations of the proposed macro system in the
       appendix to the R4RS report are available in ../../code/lang:
          + By Robert Hieb and Kent Dybvig (r4rs-syntax.tar.gz).
          + By Will Clinger (macros.will.tar.gz).
          + (cr-macro.tar.gz).
          + By Richard Kelsey and Jonathan Rees (simple-macros.tar.gz).
          + An implementation of the low-level macro facility by Antoine
            Dumesnil de Maricourt (r4rs-low-macro-1.0.tar.gz).