http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55280
--- Comment #3 from Guangmu Zhu <guangmuzhu at gmail dot com> 2012-11-12 09:22:01 UTC --- (In reply to comment #2) > As Andrew said, this is not a bug, see > http://en.wikipedia.org/wiki/Most_vexing_parse > > You can force it to be parsed as a variable declaration with A a((B())) I got it. Thanks a lot!