[Bug c++/49554] [4.7 Regression] [C++0x] lambda capture causes "cannot call member function ... without object"

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49554

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-06-27 
23:26:44 UTC ---
also, if 'b' is initialized like this it works:
    Base_iterator b = this->begin();