modernc.org/cc@v1.0.1/testdata/gcc-6.3.0/gcc/testsuite/gcc.c-torture/compile/920501-18.c (about)

     1  union u{int i;float f;};
     2  x(p)int p;{union u x;for(x.i=0;x.i<p;x.i++)if(x.f>(float)3.0)break;}