branch-1_4 cannot build Autoconf 2.59 any more

[Ralf Wildenhues]

Hello Eric,

I think an inadvertent backward incompatibility has been introduced.
Example failure:
./autom4te --language=autotest -I ../../autoconf-2.59/tests suite.at -o 
testsuite.tmp
../../autoconf-2.59/tests/local.at:370: error: m4_init: unbalanced 
m4_divert_push:
../../autoconf-2.59/tests/local.at:370: m4_divert_push: KILL
../../autoconf-2.59/tests/local.at:370: m4_divert_push: BODY
../../autoconf-2.59/tests/local.at:370: m4_divert_push: KILL
../../autoconf-2.59/tests/local.at:370: the top level

Other example failures include rebuilds triggered inside the GCC tree.
This is what I used:
m4 (GNU M4) 1.4.10b.14-ca0a

I'm pretty sure this problem is rather recent.

Cheers,
Ralf