[Bug c++/78330] New: incorrectly accepts invalid C++ code with shadowed template parameter

["su at cs dot ucdavis.edu" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78330

            Bug ID: 78330
           Summary: incorrectly accepts invalid C++ code with shadowed
                    template parameter
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu
  Target Milestone: ---

This affects at least as early as 4.8.x till the latest trunk. 


$ g++-trunk -v
Using built-in specs.
COLLECT_GCC=g++-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/usr/local/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 7.0.0 20161111 (experimental) [trunk revision 242066] (GCC) 
$ 
$ g++-trunk -c test.cpp
$ 
$ icc -c test.cpp
test.cpp(1): error: a template template parameter cannot have the same name as
one of its template parameters
  template < template < class T > class T > class A {}; 
                                        ^

compilation aborted for test.cpp (code 2)
$ 


-------------------------------------------------------


template < template < class T > class T > class A {};