gc: Memory leak in Windows and VS2010

I change the main function like this:

#define _CRTDBG_MAP_ALLOC
#include <stdlib.h>
#include <crtdbg.h>

#define MEM_CHECK_BEGIN() do { _CrtSetDbgFlag( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF ); } while(0)
#define MEM_CHECK_DUMP_LEAKS() do { _CrtDumpMemoryLeaks(); } while(0)

int main()
{
    char *result;
    MEM_CHECK_BEGIN();

    result = test_suite();
    if (result) {
        printf("%s\n", result);
    } else {
        printf("ALL TESTS PASSED\n");
    }
    printf("Tests run: %d\n", tests_run);

    MEM_CHECK_DUMP_LEAKS();
    return result != 0;
}

and the debugger report memory leaking.