[Bug preprocessor/52566] #include in c++ namespace scope doesn't work properly

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52566

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-03-12 
16:30:32 UTC ---
this has nothing to do with namespace scope, it's #pragma once confusing two
separate files as one