Changing rules of operator overload lookup

examples/operator_overloading.kl

@@ -10,6 +10,8 @@ Vec3 :: struct;; x: F32; y: F32; z: F32
 main :: (): int
   a := Vec3{1,1,1}
   b := Vec3{2,3,4}
+
+  // The expressions are replaced with the defined lambdas
   c := a + b
   Assert(c.x == 3 && c.y == 4 && c.z == 5)
   d := -c