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Re: syntax-local-binding

From: Ludovic Courtès
Subject: Re: syntax-local-binding
Date: Sun, 22 Jan 2012 01:03:07 +0100
User-agent: Gnus/5.110018 (No Gnus v0.18) Emacs/24.0.90 (gnu/linux)


Mark H Weaver <address@hidden> skribis:

> Because it breaks your nice equivalence.  For example:
>   (let ((x 1))
>     (syntax-local-binding #'x))
> is not equivalent to:
>   (let ((x 1))
>     (local-eval '(syntax-local-binding #'x) (the-environment)))
> Put another way: if anyone uses `syntax-local-binding' to distinguish
> lexical variables from macros in some clever macro of theirs, this means
> that `local-eval' is now buggy with regard to their clever macro.

What about recommending against “clever macros” that use
‘syntax-local-binding’, or documenting the limitation in how
‘local-eval’ and ‘syntax-local-binding’ would interact?

After all, the point of ‘local-eval’ is to provide a compatibility later
with 1.8, and ‘syntax-local-binding’ didn’t exist there.


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