Remove direct chaining trait impl which may be cause of Issue 6061.

Author: pnkfelix

src/libcore/hashmap.rs

@@ -56,7 +56,7 @@ fn resize_at(capacity: uint) -> uint {
 pub fn linear_map_with_capacity<K:Eq + Hash,V>(
     initial_capacity: uint) -> HashMap<K, V> {
     let r = rand::task_rng();
-    linear_map_with_capacity_and_keys(r.gen(), r.gen(),
+    linear_map_with_capacity_and_keys((*r).gen(), (*r).gen(),
                                       initial_capacity)
 }
 

src/libcore/rand.rs

@@ -688,17 +688,12 @@ pub fn task_rng() -> @IsaacRng {
     }
 }
 
-// Allow direct chaining with `task_rng`
-impl<R: Rng> Rng for @R {
-    fn next(&self) -> u32 { (*self).next() }
-}
-
 /**
  * Returns a random value of a Rand type, using the task's random number
  * generator.
  */
 pub fn random<T: Rand>() -> T {
-    task_rng().gen()
+    (*task_rng()).gen()
 }
 
 #[cfg(test)]