[Bug c++/61537] New: template parameter lists wrongly detected on "struct" or "class" keyword on parameters

[alexander.adam at informatik dot tu-chemnitz.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61537

            Bug ID: 61537
           Summary: template parameter lists wrongly detected on "struct"
                    or "class" keyword on parameters
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: alexander.adam at informatik dot tu-chemnitz.de

Created attachment 32956
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=32956&action=edit
sample code

When I define a template method outside of its template class declaration, it
cannot use the class or struct keyword on normal parameters.
This worked up to gcc 4.8. If I remove the struct or class keyword, everything
works fine again. I tried -std=c++98 without success.
If I write the definition inside the class Base { ... }; it also works.

When I try to compile the code (see attachment), I get the following error:

$ g++ main.cc
main.cc:17:38: error: too many template-parameter-lists
 void Base<T>::do_sth(S param, struct Dummy) // not working
                                      ^
main.cc:17:6: error: prototype for ‘void Base<T>::do_sth(S, int)’ does not
match any in class ‘Base<T>’
 void Base<T>::do_sth(S param, struct Dummy) // not working
      ^
main.cc:11:18: error: candidate is: template<class T> template<class S> void
Base<T>::do_sth(S, Dummy)
             void do_sth(S param, struct Dummy dummy);

$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.9/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.9.0-6'
--with-bugurl=file:///usr/share/doc/gcc-4.9/README.Bugs
--enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.9 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.9 --libdir=/usr/lib --enable-nls
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libmudflap
--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-4.9-amd64/jre --enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.9-amd64
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.9-amd64
--with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--enable-objc-gc --enable-multiarch --with-arch-32=i586 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 4.9.0 (Debian 4.9.0-6)