[Bug c++/49663] [4.7 Regression] [C++0x] ICE in lookup_base

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49663

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-07-06 
19:11:06 UTC ---
Changing the initializer to:

            tonc() : onc((onc::Cb)&grac::once<Derived>) {}

makes Comeau happy, but still gives an ICE with 4.7 and -std=c++0x