View Compilation Error

0_0_19287379_314.c: In function 'cmp':
0_0_19287379_314.c:10:12: error: 'node' undeclared (first use in this function)
  return (*(node *)e1).w - (*(node *)e2).w;
            ^
0_0_19287379_314.c:10:12: note: each undeclared identifier is reported only once for each function it appears in
0_0_19287379_314.c:10:18: error: expected expression before ')' token
  return (*(node *)e1).w - (*(node *)e2).w;
                  ^
0_0_19287379_314.c:10:36: error: expected expression before ')' token
  return (*(node *)e1).w - (*(node *)e2).w;
                                    ^