autotest problems with m4_defun and autoconf-2.64+

[Mike Frysinger]

i have a package that uses autotest and after upgrading to 2.64, it started 
issuing these errors:

$ autom4te --language=autotest -o testsuite.tmp testsuite.at
testsuite.at:4: error: m4_divert_push: cannot change diversion to `GROW' 
inside m4_expand
testsuite.at:4: the top level
autom4te-2.65: /usr/bin/m4 failed with exit status: 1
make: *** [testsuite] Error 1

the testsuite.at code looks like this:

$ cat testsuite.at
AT_INIT
m4_defun([PCALC_FILESDIR], [$srcdir])
AT_SETUP(001)
AT_CHECK([pcalc @PCALC_FILESDIR/pcalc.001], [0], [ignore])
AT_CLEANUP

if i change the m4_defun to m4_define, then it works fine.  assuming the 
intention is to get people to stop using m4_defun, perhaps it could be done 
with a little more helpful error message ?  i was using m4_defun() in a 
completely different file and erroring on the AT_CHECK() line didnt really 
clue me into the actual source of the problem.
-mike

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