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add support for variable transformers: settable identifier syntax

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* module/ice-9/psyntax.scm (set!): Handle variable transformers; though,
  they cannot produce definitions.
  (make-variable-transformer): New procedure.
  (identifier-syntax): Allow the R6RS form that makes variable
  transformers.

* module/ice-9/psyntax-pp.scm: Regenerated.

* doc/ref/r6rs.texi (R6RS Incompatibilities): Remove letrec* item, and
  add set! restriction.
This commit is contained in:
Andy Wingo 2010-06-19 12:43:40 +02:00
parent 7034da249b
commit bfccdcd530
3 changed files with 8296 additions and 7755 deletions
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10
doc/ref/r6rs.texi
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@ -24,10 +24,6 @@ intentional, some of them are bugs, and some are simply unimplemented features.
Please let the Guile developers know if you find one that is not on this list.
@itemize
@item
In the R6RS, internal definitions expand to @code{letrec*}, not @code{letrec}.
Guile does not support @code{letrec*}, though that would be nice.
@item
The R6RS specifies many situations in which a conforming implementation must
signal a specific error. Guile doesn't really care about that too much -- if a
@ -37,8 +33,12 @@ correct R6RS program would not hit that error, we don't bother checking for it.
Multiple @code{library} forms in one file are not yet supported. This is because
the expansion of @code{library} sets the current module, but does not restore
it. This is a bug.
@end itemize
@item
A @code{set!} to a variable transformer may only expand to an expression, not a
definition -- even if the original @code{set!} expression was in definition
context.
@end itemize
@node R6RS Standard Libraries
@subsection R6RS Standard Libraries