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Re: syntax-local-binding
From: |
Mark H Weaver |
Subject: |
Re: syntax-local-binding |
Date: |
Fri, 20 Jan 2012 15:26:17 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.0.92 (gnu/linux) |
Andy Wingo <address@hidden> 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
- syntax-local-binding, Andy Wingo, 2012/01/15
- Re: syntax-local-binding, Andy Wingo, 2012/01/15
- Re: syntax-local-binding, Andy Wingo, 2012/01/19
- Re: syntax-local-binding,
Mark H Weaver <=
- Re: syntax-local-binding, Andy Wingo, 2012/01/20
- Re: syntax-local-binding, Mark H Weaver, 2012/01/20
- Re: syntax-local-binding, Ludovic Courtès, 2012/01/21
- Re: syntax-local-binding, Andy Wingo, 2012/01/23
- Re: syntax-local-binding, Mark H Weaver, 2012/01/23
- Re: syntax-local-binding, Andy Wingo, 2012/01/23
- Re: syntax-local-binding, Mark H Weaver, 2012/01/23
- Re: syntax-local-binding, Andy Wingo, 2012/01/24
- Re: syntax-local-binding, Noah Lavine, 2012/01/24
- Re: syntax-local-binding, Peter TB Brett, 2012/01/24