gcc-4.9/gcc/testsuite/gcc.c-torture/execute/990524-1.c


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char a[] = "12345";
char b[] = "12345";

void loop (char * pz, char * pzDta)
{
    for (;;) {
        switch (*(pz++) = *(pzDta++)) {
        case 0:
  	    goto loopDone2;

	case '"':
	case '\\':
	    pz[-1]  = '\\';
            *(pz++) = pzDta[-1];
	}
    } loopDone2:;

  if (a - pz != b - pzDta)
    abort ();
}

main()
{
  loop (a, b);
  exit (0);
}