A stray $ is a warning in the actions, but an error in the epilogue.
IMHO, it should not even be a warning in the epilogue.
-** obstack_copy etc.
-There seems to be some other interesting functions for obstacks that
-we should consider using.
-
** stack.hh
Get rid of it. The original idea is nice, but actually it makes
the code harder to follow, and uselessly different from the other