View Compilation Error

0_0_22076285_25589.cpp: In function 'bool on(V2D, V2D, V2D)':
0_0_22076285_25589.cpp:236:55: error: expected ';' before ')' token
  return within(a.x, x.x, b.x) && within(a.y, x.y, b.y));
                                                       ^
0_0_22076285_25589.cpp:236:55: error: expected primary-expression before ')' token