[Bug c++/52030] New: ICE with decltype(make_tuple) is a late return type

["public at alisdairm dot net" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52030

             Bug #: 52030
           Summary: ICE with decltype(make_tuple) is a late return type
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: public@alisdairm.net


The following sample code compiles with gcc 4.6.2, but produces and ICE for
recent 4.7 builds:

#include <tuple>

using namespace std;

template<typename ...T>
auto factory(T... t) -> decltype(make_tuple(t...)) {
   return make_tuple(t...);
}

auto main() -> int {
   auto x = factory(3);
}


Reported error:
tree check: expected tree_list, have  in eq_local_specializations, at
cp/pt.c:1687

Version info of compiler I am testing with:
Using built-in specs.
COLLECT_GCC=g++-mp-4.7
COLLECT_LTO_WRAPPER=/opt/local/libexec/gcc/x86_64-apple-darwin11/4.7.0/lto-wrapper
Target: x86_64-apple-darwin11
Configured with: ../gcc-4.7-20120121/configure --prefix=/opt/local
--build=x86_64-apple-darwin11 --enable-languages=c,c++,objc,obj-c++
--libdir=/opt/local/lib/gcc47 --includedir=/opt/local/include/gcc47
--infodir=/opt/local/share/info --mandir=/opt/local/share/man
--datarootdir=/opt/local/share/gcc-4.7 --with-local-prefix=/opt/local
--with-system-zlib --disable-nls --program-suffix=-mp-4.7
--with-gxx-include-dir=/opt/local/include/gcc47/c++/ --with-gmp=/opt/local
--with-mpfr=/opt/local --with-mpc=/opt/local --enable-stage1-checking
--disable-multilib --enable-lto
Thread model: posix
gcc version 4.7.0 20120121 (experimental) (GCC)