[Bug preprocessor/36453] [DR 412] PR36320 breaks boost

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=36453

--- Comment #14 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
http://www.open-std.org/jtc1/sc22/wg14/www/docs/dr_412.htm