only bend hygiene in macro-introduced output, not for explicit @/@@

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* module/ice-9/psyntax.scm
* module/ice-9/psyntax-pp.scm
* module/ice-9/boot-9.scm (make-module-ref): We were so almost there
  with what we had, sniff. The deal is that
    (begin (load "foo.scm") ((@@ (foo) bar)))
  would expand to
    (begin (load "foo.scm") (bar))
  because bar was unbound at expansion time, and make-module-ref assumed
  it was like the else in a cond. But it shouldn't have, because we
  /explicitly/ asked for the @@ var -- so now if we see a @ or @@, we
  never drop it. @@ introduced by hygiene can be dropped if it doesn't
  reference a var, though.

  Practically speaking, this means tagging all modules in psyntax with
  their intent: public or private (corresponding to @ or @@), hygiene
  (introduced by a macro), or bare (when we don't have a module). I'm
  not sure when we'd see a bare.

  The implementation is complicated by the need to support the old
  format and the new format at the same time, so that psyntax-pp can be
  regenerated.

...

This commit is contained in:

Andy Wingo 2009-04-24 13:13:29 +02:00

parent 384e92b3ae

commit a2716cbe1e

3 changed files with 50 additions and 49 deletions

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