use std::ops::Add;

pub mod point;
pub mod rect;

pub type Point<T> = point::Point<T>;
pub type Rect<T> = rect::Rect<T>;

trait One<T> {
    fn one() -> T;
}

impl<T> One<T> for T
    where T: Add<i32, Output=T> + Default
{
    fn one() -> T {
        T::default() + 1
    }
}

use std::ops::Add;

pub mod point;
pub mod rect;

pub type Point<T> = point::Point<T>;
pub type Rect<T> = rect::Rect<T>;

trait One<T>
    where T: Add<i32, Output=T> +
             Default
{
    fn one() -> T {
        T::default() + 1
    }
}

impl<T> One<T> for T
    where T: Default + Add<i32, Output=T>
{ /* derived implementor */ }

--- 
+++ 
@@ -6,14 +6,15 @@
 pub type Point<T> = point::Point<T>;
 pub type Rect<T> = rect::Rect<T>;
 
-trait One<T> {
-    fn one() -> T;
-}
-
-impl<T> One<T> for T
-    where T: Add<i32, Output=T> + Default
+trait One<T>
+    where T: Add<i32, Output=T> +
+             Default
 {
     fn one() -> T {
         T::default() + 1
     }
 }
+
+impl<T> One<T> for T
+    where T: Default + Add<i32, Output=T>
+{ /* derived implementor */ }
Change how One trait is implemented
