typeof() does not property recognizes the non-const type, which was casted from
const type:

$ cat plik.c
#include <stdio.h>

int main()
    const unsigned long val;
    typeof( ((unsigned long)(val)) ) val2;
    val2 = 0; //compilation error

$ gcc -o plik plik.c
plik.c: In function âmainâ:
plik.c:7: error: assignment of read-only variable âval2â

$ gcc --version
gcc (GCC) 4.4.3 20100127 (Red Hat 4.4.3-4)

           Summary: typeof with casting from const to non-const does not
                    work properly
           Product: gcc
           Version: 4.4.3
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: radoslaw dot biernacki at gmail dot com
 GCC build triplet: 4.4.3 20100127 (Red Hat 4.4.3-4)
  GCC host triplet: Linux TVBuildAlfa #1 SMP


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