On 11/26/2013 10:19 AM, John Cowan wrote:
> Michael Montague scripsit:
>
>> I propose dropping the requirement that 'regexp' can be called with
>> an already compiled <re>. It provides no additional functionality
>> and it makes the specification of 'regexp' less clear.
> It provides the ability to compile repeatedly used parts of regular
> expressions.  In a context where a large number of regular expressions
> are in use that have factors in common, this can save a good deal of
> time and possibly space.

That would require calling 'regexp' with a <sre> containing an <re>. I
don't see where in the grammar that you are allowed to have an <re> as
part of an <sre>.