Andy Wingo <wi...@pobox.com> writes:
> `lexical'
> A lexically-bound variable. The value is a unique token (in
> the sense of `eq?') identifying this binding.
>
> `macro'
> A syntax transformer, either local or global. The value is
> the transformer procedure.
Ironically, `syntax-local-binding' renders the current simple
implementation strategy of `the-environment' inadequate, because
identifier-syntax is no longer sufficient to simulate a lexical.
More importantly, this exposing of internal binding representations will
interfere with our ability to change the representations later.
In particular, I was hoping to change the binding representation of
`syntax-rules' macros so that they are serializable. In particular,
they would be represented by the `syntax-rules' form itself (the same
one that psyntax currently passes to `primitive-eval' to produce the
transformer procedure). A weak-key hash table would cache the compiled
transformer procedures.
This would allow (the-environment) to capture locally-bound
`syntax-rules' macros. Unfortunately, `syntax-local-binding', as
currently documented, now makes this impossible.
Thanks,
Mark
