http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46283
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-02-01 02:56:10 UTC --- I think the code should be rejected. Here is what Comeau online says: "ComeauTest.c", line 14: error: ambiguous class member reference -- type "b::foo" (declared at line 4) used in preference to type "a::foo" (declared at line 10)