use std::cmp::Ordering;
use std::hash::{Hash, Hasher};
use uuid::Uuid;

pub struct JsType {
    uid: Uuid,
    thing: Box<JsThing>,
}

impl JsType {
    fn new(thing: Box<JsThing>) -> JsType {
        JsType {
            uid: Uuid::new_v4(),
            thing: thing,
        }
    }
}

impl PartialEq for JsType {
    fn eq(&self, other: &Self) -> bool {
        self.uid == other.uid
    }

    fn ne(&self, other: &Self) -> bool {
        !self.eq(other)
    }
}

impl Eq for JsType{}

impl Hash for JsType {
    fn hash<H>(&self, state: &mut H) where H: Hasher {
        self.uid.hash(state);
    }

    fn hash_slice<H>(data: &[Self], state: &mut H) where H: Hasher {
        for ref d in data {
            d.uid.hash(state);
        }
    }
}

pub trait JsThing {}

use std::cmp::Ordering;

pub struct JsType {
    uid: u64,
    thing: Box<JsThing>,
}

impl PartialEq for JsType {
    fn eq(&self, other: &Self) -> bool {
        self.uid == other.uid
    }

    fn ne(&self, other: &Self) -> bool {
        !self.eq(other)
    }
}

impl Eq for JsType{}

impl PartialOrd for JsType {
    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
        Some(self.uid.cmp(&other.uid))
    }
}

impl Ord for JsType {
    fn cmp(&self, other: &Self) -> Ordering {
        self.uid.cmp(&other.uid)
    }
}

pub trait JsThing {}

--- 
+++ 
@@ -1,19 +1,8 @@
 use std::cmp::Ordering;
-use std::hash::{Hash, Hasher};
-use uuid::Uuid;
 
 pub struct JsType {
-    uid: Uuid,
+    uid: u64,
     thing: Box<JsThing>,
-}
-
-impl JsType {
-    fn new(thing: Box<JsThing>) -> JsType {
-        JsType {
-            uid: Uuid::new_v4(),
-            thing: thing,
-        }
-    }
 }
 
 impl PartialEq for JsType {
@@ -28,15 +17,15 @@
 
 impl Eq for JsType{}
 
-impl Hash for JsType {
-    fn hash<H>(&self, state: &mut H) where H: Hasher {
-        self.uid.hash(state);
+impl PartialOrd for JsType {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.uid.cmp(&other.uid))
     }
+}
 
-    fn hash_slice<H>(data: &[Self], state: &mut H) where H: Hasher {
-        for ref d in data {
-            d.uid.hash(state);
-        }
+impl Ord for JsType {
+    fn cmp(&self, other: &Self) -> Ordering {
+        self.uid.cmp(&other.uid)
     }
 }
 
Make JsType Hash instead of Ord
