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From: "spraff at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/56462] New: Simple use of auto in template function causes internal error in type_unification_real
Date: Tue, 26 Feb 2013 16:06:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D56462

             Bug #: 56462
           Summary: Simple use of auto in template function causes
                    internal error in type_unification_real
    Classification: Unclassified
           Product: gcc
           Version: 4.5.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: spraff@gmail.com


Here is a complete source file which causes the error

*********************************************
template <typename F>
void foo (F & f)
{
        auto f_copy =3D *f;
}
*********************************************

Compiling this on ubuntu 12.04 with

    g++ test.cpp -std=3Dc++0x

yields the following error

    test.cpp: In function =E2=80=98void foo(F&)=E2=80=99:
    test.cpp:4:17: internal compiler error: in type_unification_real, at
cp/pt.c:13573