[Bug libstdc++/66742] abort on sorting list with custom compiler that is not stateless

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66742

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
A candidate patch has been posted to
https://gcc.gnu.org/ml/gcc-patches/2015-07/msg00217.html

With that fix your testcase segfaults, because you allocate n bytes not
n*sizeof(Tp).