------- Comment #12 from jason at gcc dot gnu dot org 2009-08-19 18:50 ------- GCC now says "sorry, not implemented: mangling trait_expr", which is more informative. I'm inclined to leave it that way until the ABI specifies how these things should be mangled, which may need to wait until we know the final set of trait builtins we want for C++0x. People can work around this issue by either using std::is_empty or making their own equivalent class template.
-- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36797
