[Bug c++/50755] New: [ICE]: tree check: expected class 'constant', have 'unary' (convert_expr)

["gjl at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50755

             Bug #: 50755
           Summary: [ICE]: tree check: expected class 'constant', have
                    'unary' (convert_expr)
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: gjl@gcc.gnu.org
                CC: jason@gcc.gnu.org
            Target: avr
             Build: x86-pc-linux-gnu


Following test case runs into ICE with trunk r180076:

avr-g++ -v ./gcc/testsuite/g++.dg/template/constant2.C  -S -mmcu=atmega128  -o
constant2.s

Using built-in specs.

Configured with: ../../gcc.gnu.org/trunk/configure --target=avr
--prefix=/local/gnu/install/gcc-4.7 --disable-nls --disable-shared
--enable-languages=c,c++ --with-dwarf2 --disable-lto --enable-checking=yes,rtl
Thread model: single
gcc version 4.7.0 20111017 (experimental) (GCC)

GNU C++ (GCC) version 4.7.0 20111017 (experimental) (avr)
        compiled by GNU C version 4.3.2 [gcc-4_3-branch revision 141291], GMP
version 5.0.1, MPFR version 3.0.0-p8, MPC version 0.8.2

./gcc/testsuite/g++.dg/template/constant2.C:6:35: internal compiler error: tree
check: expected class 'constant', have 'unary' (convert_expr) in
warnings_for_convert_and_check, at c-family/c-common.c:2211