[Bug c++/61642] New: g++ confuses template member template function with template class

["felix at fontein dot de" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61642

            Bug ID: 61642
           Summary: g++ confuses template member template function with
                    template class
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: felix at fontein dot de

The following code does not compile under GCC 4.9.0 20140604 (prerelease):

---------8<---------8<---------8<---------
template<typename T> struct X { };

template<typename Ftype, int x, int y>
void fCall(Ftype & f)
{
    f.template X<x, y>(); // compiler stops here, confuses f's 
                          // member template X with the template
                          // class X defined above  
}

// To be used like this:

struct F
{
    template<int x, int y> void X() { }
};

int main()
{
    F f;
    fCall<F, 1, 2>(f);
}
---------8<---------8<---------8<---------

The error message:

$ g++ -Wall -Wextra t2.cpp -o t2
t2.cpp: In function âvoid fCall(Ftype&)â:
t2.cpp:6:22: error: wrong number of template arguments (2, should be 1)
     f.template X<x, y>();
                      ^
t2.cpp:1:29: error: provided for âtemplate<class T> struct Xâ
 template<typename T> struct X { };


$ g++ -v

Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-unknown-linux-gnu/4.9.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: /build/gcc/src/gcc-4.9-20140604/configure --prefix=/usr
--libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man
--infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-clocale=gnu --disable-libstdcxx-pch
--disable-libssp --enable-gnu-unique-object --enable-linker-build-id
--enable-cloog-backend=isl --disable-isl-version-check
--disable-cloog-version-check --enable-lto --enable-plugin
--enable-install-libiberty --with-linker-hash-style=gnu --disable-multilib
--disable-werror --enable-checking=release
Thread model: posix
gcc version 4.9.0 20140604 (prerelease) (GCC)