Change `Debug` implementation of `BTree*` as well

src/libcollections/btree/map.rs

@@ -899,7 +899,7 @@ fn cmp(&self, other: &BTreeMap<K, V>) -> Ordering {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<K: Debug, V: Debug> Debug for BTreeMap<K, V> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        try!(write!(f, "BTreeMap {{"));
+        try!(write!(f, "{{"));
 
         for (i, (k, v)) in self.iter().enumerate() {
             if i != 0 { try!(write!(f, ", ")); }

src/libcollections/btree/set.rs

@@ -613,7 +613,7 @@ fn bitor(self, rhs: &BTreeSet<T>) -> BTreeSet<T> {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: Debug> Debug for BTreeSet<T> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        try!(write!(f, "BTreeSet {{"));
+        try!(write!(f, "{{"));
 
         for (i, x) in self.iter().enumerate() {
             if i != 0 { try!(write!(f, ", ")); }
@@ -911,7 +911,7 @@ fn test_show() {
 
         let set_str = format!("{:?}", set);
 
-        assert_eq!(set_str, "BTreeSet {1, 2}");
-        assert_eq!(format!("{:?}", empty), "BTreeSet {}");
+        assert_eq!(set_str, "{1, 2}");
+        assert_eq!(format!("{:?}", empty), "{}");
     }
 }