c++/9154: [3.4 regression] [diagnostic] poor error message for ">>" vs. "> >" for nested template args

[Giovanni Bajo]

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9154

For reference, Comeau gives:

"pr9154.cpp", line 6: error: space required between adjacent ">" delimiters
of
          nested template argument lists (">>" is the right shift operator)
        a<a<int>> blah;
               ^

Giovanni Bajo