[Bug c++/52174] Implicit conversion of nullptr to bool

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52174

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-02-08 
16:55:26 UTC ---
but N.B. http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#1423