[Bug c++/51313] New: [C++0x] ICE: tree check: expected class 'constant', have 'unary' (nop_expr) in null_ptr_cst_p, at cp/call.c:556

["y121516 at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51313

             Bug #: 51313
           Summary: [C++0x] ICE: tree check: expected class 'constant',
                    have 'unary' (nop_expr) in null_ptr_cst_p, at
                    cp/call.c:556
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: y121516@gmail.com


The ICE occurred with -std=c++0x option.
If not use -std=c++0x option then the ICE not occurred


Codes (a.cpp):

#include<iostream>
#include<cctype>

int main()
{
  std::cout << isdigit(0);
}


Compiler errors:

$ g++4.7 -std=c++0x a.cpp
a.cpp: In function 'int main()':
a.cpp:6:25: internal compiler error: tree check: expected class 'constant',
have 'unary' (nop_expr) in null_ptr_cst_p
, at cp/call.c:556
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.


Version info:

$ g++4.7 -v
Built by Equation Solution <http://www.Equation.com>.
Using built-in specs.
COLLECT_GCC=C:\cygwin\home\RiSK\misc\gcc4.7\bin\g++.exe
COLLECT_LTO_WRAPPER=c:/cygwin/home/risk/misc/gcc4.7/bin/../libexec/gcc/i686-pc-mingw32/4.7.0/lto-wrapper.exe
Target: i686-pc-mingw32
Configured with: ../gcc-4.7-20111119-mingw/configure --host=i686-pc-mingw32
--build=x86_64-unknown-linux-gnu --target
=i686-pc-mingw32
--prefix=/home/gfortran/gcc-home/binary/mingw32/native/x86_32/gcc/4.7-20111119
--with-gcc --with-gnu
-as --with-gnu-ld --with-host-libstdcxx='-lstdc++ -lsupc++ -lm'
--with-ppl=/home/gfortran/gcc-home/binary/mingw32/nat
ive/x86_32/ppl
--with-cloog=/home/gfortran/gcc-home/binary/mingw32/native/x86_32/cloog
--with-gmp=/home/gfortran/gcc-
home/binary/mingw32/native/x86_32/gmp
--with-mpfr=/home/gfortran/gcc-home/binary/mingw32/native/x86_32/mpfr --with-mp
c=/home/gfortran/gcc-home/binary/mingw32/native/x86_32/mpc
--with-sysroot=/home/gfortran/gcc-home/binary/mingw32/cros
s/x86_32/gcc/4.7-20111119 --disable-shared --disable-nls --disable-tls
--disable-win32-registry --enable-libquadmath-
support --enable-libquadmath --enable-languages=c,c++,fortran --enable-libgomp
--enable-threads=win32 --enable-lto --
enable-static --enable-shared=lto-plugin --enable-plugins --enable-ld=yes
--enable-cloog-backend=ppl
Thread model: win32
gcc version 4.7.0 20111119 (experimental) (GCC)