Created attachment 31183 [details]
The preprocessed code

This bug seems to be related to bug 59044 (http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59044).

The following code when compiled with 'g++ spec.cpp' is rejected by gcc 4.8.1:

/* ---- spec.cpp ---------------------------------------- */
namespace N {

template <class T>
struct C {
    template <class U, T t>
    struct Implementation {};
};

template <class T>
template <T t>
struct C<T>::Implementation<void, t> {
    static void method() {}
};

}

int main() {
    N::C<int>::Implementation<void, 0>::method();
}
/* ---------------------------------------------------- */

The bug is only triggered when the second template argument is a non-type template argument dependent on the template argument of the enclosing class template. The error message produced by g++ 4.8.1 (as found in the g++-4.8 package in the Ubuntu 13.10 repo, see below for build information):

spec.cpp: In function ‘int main()’:
spec.cpp:18:5: error: ‘method’ is not a member of ‘N::C<int>::Implementation<void, 0>’
     N::C<int>::Implementation<void, 0>::method();
     ^

This bug is still present in the gcc-snapshot package. However the code compiles fine in g++ 4.7.3 (as found in the g++-4.7 package).

Additional information:

GCC version: gcc version 4.8.1 (Ubuntu/Linaro 4.8.1-10ubuntu8) 
System type: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.8.1-10ubuntu8' --with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.8 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu