Typo: .substr in pmacros.texi is .substring in pmacros.scm

[Doug Evans]

Hans-Peter Nilsson writes:
 > I didn't see any argument against it, except for the comment in
 > the code.  This works for my simple command-line examples
 > including the one in the comment but beware of the scheme/CGEN
 > newbie.  (Is this an ok way to compose ChangeLog entries for
 > nested defines?)

btw, do you have an actual use for it?
Or is this just something that you think might be
useful in the future?