Re: scheme.el bug & fix

[Stefan Monnier]

>     Note that with-syntax-table was introduced in Emacs-21, so it's
>     rarely used in external packages (most packages try to maintain
>     compatibility with Emacs-20, and most package writers learn
>     new macros rather slowly).
> 
> Gerd said there may have been an XEmacs compatibility issue.
> Perhaps people have written code for XEmacs which assumes
> with-syntax-table copies the syntax table.

XEmacs indeed does the copying, but its docstring does not document
that behavior.

> But I suspect that the amount of such code is small, and that this
> change is ok.

Indeed, within XEmacs-21.1 (an old version, admittedly), it's only used
in help.el and (in the unbundled XEmacs packages) in semantic.el.
In both cases, it does not need copying.


        Stefan