[Bug c++/54543] New: Expression (condition ? array : throw expr)[index] fails to compile

["tsoae at mail dot ru" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54543

             Bug #: 54543
           Summary: Expression (condition ? array : throw expr)[index]
                    fails to compile
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: tsoae@mail.ru


g++ 4.8.0 20120909 (experimental) fails to compile the following well-defined
code:

    int f(int (&arr)[10], int n)
    {
        return ((0 <= n && n < 10) ? arr : throw "error")[n];
    }

    int main() {}

COLLECT_GCC_OPTIONS='-v' '-std=c++11' '-shared-libgcc' '-mtune=generic'
'-march=pentiumpro'

test.cpp: In function âint f(int (&)[10], int)â:
test.cpp:3:46: error: void value not ignored as it ought to be
     return ((0 <= n && n < 10) ? arr : throw "error")[n];
                                              ^

Compiler version info:

Target: i686-pc-linux-gnu
Configured with: ../configure --prefix=../target --enable-languages=c,c++
Thread model: posix
GNU C++ (GCC) version 4.8.0 20120909 (experimental) (i686-pc-linux-gnu)
    compiled by GNU C version 4.8.0 20120909 (experimental), GMP version 5.0.2,
MPFR version 3.1.0, MPC version 0.8.2