[PATCH] Restore read/source-info in support.scm and export it officially from (chicken syntax)

[felix . winkelmann]

> Hi all,
>
> I was checking the Salmonella results and it seems a good number of eggs
> are actually relying on chicken.compiler.support#read/source-info and
> therefore break with the current master:
> http://salmonella-linux-x86.call-cc.org/master/clang/linux/x86/2023/06/28/yesterday-diff/
>
> The attached patch restores the procedure in support.scm, but keeps the
> implementation itself in chicken.syntax, where it makes more sense.
> Since these eggs are using it, that TODO above ##sys#read/source-info
> is settled - it's useful enough for those eggs, so let's just expose
> it publically and document it.
>

Thanks, pushed.


felix