[rust mode] Update primitive types

mode/rust/rust.js

@@ -26,7 +26,7 @@ CodeMirror.defineMode("rust", function() {
   };
   var typeKeywords = function() {
     var keywords = {"fn": "fn", "block": "fn", "obj": "obj"};
-    var atoms = "bool uint int i8 i16 i32 i64 u8 u16 u32 u64 float f32 f64 str char".split(" ");
+    var atoms = "bool i8 i16 i32 i64 u8 u16 u32 u64 f32 f64 str char isize usize".split(" ");
     for (var i = 0, e = atoms.length; i < e; ++i) keywords[atoms[i]] = "atom";
     return keywords;
   }();