I hope it's a valid "auto". the code works if I write "int" instead of "auto".
It might be related to Bug 43281 internal compiler error: in type_unification_real, at cp/pt.c:13486 template <typename T > void shuffle(const T& first, const T& last) { auto w = *first; } int main() { int b[5]; shuffle(&b[0],&b[4]); } g++-4.5 -v Using built-in specs. COLLECT_GCC=g++-4.5 COLLECT_LTO_WRAPPER=/home/rakadam/streamplusplus/local/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.5.0/lto-wrapper Target: x86_64-unknown-linux-gnu Configured with: ../configure --enable-languages=c,c++ --program-suffix=-4.5 --prefix=/home/rakadam/streamplusplus/src/third_party/gcc-trunk/build_gcc/../../../../local --enable-lto --disable-bootstrap --enable-gold Thread model: posix gcc version 4.5.0 20100306 (experimental) (GCC) -- Summary: [c++0x] ICE on valid auto Product: gcc Version: 4.5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: adam dot rak at streamnovation dot com GCC build triplet: x86_64-unknown-linux GCC host triplet: x86_64-unknown-linux GCC target triplet: x86_64-unknown-linux http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43321