diff --git a/benches/bench_struct.rs b/benches/bench_struct.rs
index c9b75a81..edc71000 100644
--- a/benches/bench_struct.rs
+++ b/benches/bench_struct.rs
@@ -283,7 +283,7 @@ mod decoder {
             match self.stack.pop() {
                 Some(MapState(map)) => {
                     let len = map.len();
-                    for (key, value) in map.into_iter() {
+                    for (key, value) in map {
                         match value {
                             Some(c) => {
                                 self.stack.push(CharState(c));
@@ -404,7 +404,7 @@ mod deserializer {
                 Some(MapState(value)) => {
                     self.stack.push(EndState);
                     let len = value.len();
-                    for (key, value) in value.into_iter() {
+                    for (key, value) in value {
                         match value {
                             Some(c) => {
                                 self.stack.push(CharState(c));
diff --git a/serde2/src/json/de.rs b/serde2/src/json/de.rs
index 9b59d90a..73d797bd 100644
--- a/serde2/src/json/de.rs
+++ b/serde2/src/json/de.rs
@@ -547,7 +547,7 @@ mod tests {
     fn test_parse_ok<'a, T>(errors: Vec<(&'a str, T)>)
         where T: PartialEq + Debug + Deserialize,
     {
-        for (s, value) in errors.into_iter() {
+        for (s, value) in errors {
             let v: Result<T, Error> = from_str(s);
             assert_eq!(v, Ok(value));
 
@@ -561,7 +561,7 @@ mod tests {
     fn test_parse_err<'a, T>(errors: Vec<(&'a str, Error)>)
         where T: PartialEq + Debug + Deserialize
     {
-        for (s, err) in errors.into_iter() {
+        for (s, err) in errors {
             let v: Result<T, Error> = from_str(s);
             assert_eq!(v, Err(err));
         }
diff --git a/src/json/mod.rs b/src/json/mod.rs
index 629dcff5..17d749bf 100644
--- a/src/json/mod.rs
+++ b/src/json/mod.rs
@@ -427,7 +427,7 @@ mod tests {
     fn test_encode_ok<
         T: PartialEq + Debug + ToJson + ser::Serialize<super::Serializer<Vec<u8>>, old_io::IoError>
     >(errors: &[(T, &str)]) {
-        for &(ref value, out) in errors.iter() {
+        for &(ref value, out) in errors {
             let out = out.to_string();
 
             let s = super::to_string(value).unwrap();
@@ -441,7 +441,7 @@ mod tests {
     fn test_pretty_encode_ok<
         T: PartialEq + Debug + ToJson + ser::Serialize<super::PrettySerializer<Vec<u8>>, old_io::IoError>
     >(errors: &[(T, &str)]) {
-        for &(ref value, out) in errors.iter() {
+        for &(ref value, out) in errors {
             let out = out.to_string();
 
             let s = super::to_pretty_string(value).unwrap();
@@ -778,7 +778,7 @@ mod tests {
         'a,
         T: Debug + de::Deserialize<Parser<str::Bytes<'a>>, Error>
     >(errors: &[(&'a str, Error)]) {
-        for &(s, ref err) in errors.iter() {
+        for &(s, ref err) in errors {
             let v: Result<T, Error> = from_str(s);
             assert_eq!(v.unwrap_err(), *err);
         }
@@ -788,7 +788,7 @@ mod tests {
         'a,
         T: PartialEq + Debug + ToJson + de::Deserialize<Parser<str::Bytes<'a>>, Error>
     >(errors: &[(&'a str, T)]) {
-        for &(s, ref value) in errors.iter() {
+        for &(s, ref value) in errors {
             let v: T = from_str(s).unwrap();
             assert_eq!(v, *value);
 
@@ -800,7 +800,7 @@ mod tests {
     fn test_json_deserialize_ok<
         T: PartialEq + Debug + ToJson + de::Deserialize<value::Deserializer, Error>
     >(errors: &[T]) {
-        for value in errors.iter() {
+        for value in errors {
             let v: T = from_json(value.to_json()).unwrap();
             assert_eq!(v, *value);
 
diff --git a/src/json/value.rs b/src/json/value.rs
index 01052a39..9fee4671 100644
--- a/src/json/value.rs
+++ b/src/json/value.rs
@@ -60,7 +60,7 @@ impl Value {
     /// Otherwise, it will return the Json value associated with the final key.
     pub fn find_path<'a>(&'a self, keys: &[&String]) -> Option<&'a Value>{
         let mut target = self;
-        for key in keys.iter() {
+        for key in keys {
             match target.find(*key) {
                 Some(t) => { target = t; },
                 None => return None
@@ -79,7 +79,7 @@ impl Value {
                     Some(json_value) => Some(json_value),
                     None => {
                         let mut value : Option<&'a Value> = None;
-                        for (_, v) in map.iter() {
+                        for (_, v) in map {
                             value = v.search(key);
                             if value.is_some() {
                                 break;
@@ -643,7 +643,7 @@ impl<A:ToJson> ToJson for Vec<A> {
 impl<A:ToJson> ToJson for BTreeMap<String, A> {
     fn to_json(&self) -> Value {
         let mut d = BTreeMap::new();
-        for (key, value) in self.iter() {
+        for (key, value) in self {
             d.insert((*key).clone(), value.to_json());
         }
         Value::Object(d)
@@ -653,7 +653,7 @@ impl<A:ToJson> ToJson for BTreeMap<String, A> {
 impl<A:ToJson> ToJson for HashMap<String, A> {
     fn to_json(&self) -> Value {
         let mut d = BTreeMap::new();
-        for (key, value) in self.iter() {
+        for (key, value) in self {
             d.insert((*key).clone(), value.to_json());
         }
         Value::Object(d)