Implementation of macro expand-once command

Billy Brownstocking <[email protected]>
Newsgroups gmane.comp.gdb.devel
Message-ID <CACQCoj5Eg0C7LETcAtQckW1C2xzYzRJRLKkQzHBzZ+_3nqgd9Q@mail.gmail.com> 
The macro_expand_once function was introduced by commit ec2bcbe7540
back in 2002,
but it's remained a stub ever since.

Are there specific challenges that have prevented its implementation
thus far? Or has it been considered low-priority all this time?
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