Unexpanded syncline

[Akim Demaille]

I have not tracked this down yet, maybe someone will
find easily what's going on.

address@hidden ~/src/bison $ grep b4_ examples/calc++/calc++- 
parser.cc           21:56:23
#line 1 "[Bison:b4_percent_define_default]"
#line 1 "[Bison:b4_percent_define_default]"

I guess it's a # that is not quoted, hence the line
is taken as a comment, in which case there is no
macro expansion performed.