I wrote:
>
> Incidentally, is the regex-error error key described in the scheme
> section of this node be regular-expression-syntax, as per the
> `make-regexp' doco?

I propose to make the following correction, to the head and also to
the 1.6 branch,

        * scheme-control.texi (Handling Errors): Fix regexp error key is
        regular-expression-syntax.