[Bug libstdc++/47668] missing 'typename' in debug-mode map

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47668

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-02-09 
20:49:26 UTC ---
hmm, yes, that might be ok too, as it will still be found from the base class
(I think!)