diff --git a/src/conversion.rs b/src/conversion.rs
index d7db574..e643e93 100644
--- a/src/conversion.rs
+++ b/src/conversion.rs
@@ -37,7 +37,7 @@ impl<'lua> FromLua<'lua> for String<'lua> {
 }
 
 impl<'lua> ToLua<'lua> for Table<'lua> {
-    fn to_lua(self, _: &'lua Lua) -> Result<Value> {
+    fn to_lua(self, _: &'lua Lua) -> Result<Value<'lua>> {
         Ok(Value::Table(self))
     }
 }
@@ -270,14 +270,16 @@ impl<'lua, T: FromLua<'lua>> FromLua<'lua> for Vec<T> {
 }
 
 impl<'lua, K: Eq + Hash + ToLua<'lua>, V: ToLua<'lua>, S: BuildHasher> ToLua<'lua>
-    for HashMap<K, V, S> {
+    for HashMap<K, V, S>
+{
     fn to_lua(self, lua: &'lua Lua) -> Result<Value<'lua>> {
         Ok(Value::Table(lua.create_table_from(self)?))
     }
 }
 
 impl<'lua, K: Eq + Hash + FromLua<'lua>, V: FromLua<'lua>, S: BuildHasher + Default> FromLua<'lua>
-    for HashMap<K, V, S> {
+    for HashMap<K, V, S>
+{
     fn from_lua(value: Value<'lua>, _: &'lua Lua) -> Result<Self> {
         if let Value::Table(table) = value {
             table.pairs().collect()
diff --git a/src/multi.rs b/src/multi.rs
index 3b22c5a..4d5a25a 100644
--- a/src/multi.rs
+++ b/src/multi.rs
@@ -139,7 +139,7 @@ impl<'lua, T: FromLua<'lua>> FromLuaMulti<'lua> for Variadic<T> {
 macro_rules! impl_tuple {
     () => (
         impl<'lua> ToLuaMulti<'lua> for () {
-            fn to_lua_multi(self, _: &'lua Lua) -> Result<MultiValue> {
+            fn to_lua_multi(self, _: &'lua Lua) -> Result<MultiValue<'lua>> {
                 Ok(MultiValue::new())
             }
         }
diff --git a/src/userdata.rs b/src/userdata.rs
index 21af656..72e557a 100644
--- a/src/userdata.rs
+++ b/src/userdata.rs
@@ -89,7 +89,7 @@ impl<'lua, T: UserData> UserDataMethods<'lua, T> {
     where
         A: FromLuaMulti<'lua>,
         R: ToLuaMulti<'lua>,
-        M: 'static + Send + for<'a> Fn(&'lua Lua, &'a T, A) -> Result<R>,
+        M: 'static + Send + Fn(&'lua Lua, &T, A) -> Result<R>,
     {
         self.methods
             .insert(name.to_owned(), Self::box_method(method));
@@ -104,7 +104,7 @@ impl<'lua, T: UserData> UserDataMethods<'lua, T> {
     where
         A: FromLuaMulti<'lua>,
         R: ToLuaMulti<'lua>,
-        M: 'static + Send + for<'a> FnMut(&'lua Lua, &'a mut T, A) -> Result<R>,
+        M: 'static + Send + FnMut(&'lua Lua, &mut T, A) -> Result<R>,
     {
         self.methods
             .insert(name.to_owned(), Self::box_method_mut(method));
@@ -155,7 +155,7 @@ impl<'lua, T: UserData> UserDataMethods<'lua, T> {
     where
         A: FromLuaMulti<'lua>,
         R: ToLuaMulti<'lua>,
-        M: 'static + Send + for<'a> Fn(&'lua Lua, &'a T, A) -> Result<R>,
+        M: 'static + Send + Fn(&'lua Lua, &T, A) -> Result<R>,
     {
         self.meta_methods.insert(meta, Self::box_method(method));
     }
@@ -172,7 +172,7 @@ impl<'lua, T: UserData> UserDataMethods<'lua, T> {
     where
         A: FromLuaMulti<'lua>,
         R: ToLuaMulti<'lua>,
-        M: 'static + Send + for<'a> FnMut(&'lua Lua, &'a mut T, A) -> Result<R>,
+        M: 'static + Send + FnMut(&'lua Lua, &mut T, A) -> Result<R>,
     {
         self.meta_methods.insert(meta, Self::box_method_mut(method));
     }
@@ -234,7 +234,7 @@ impl<'lua, T: UserData> UserDataMethods<'lua, T> {
     where
         A: FromLuaMulti<'lua>,
         R: ToLuaMulti<'lua>,
-        M: 'static + Send + for<'a> Fn(&'lua Lua, &'a T, A) -> Result<R>,
+        M: 'static + Send + Fn(&'lua Lua, &T, A) -> Result<R>,
     {
         Box::new(move |lua, mut args| {
             if let Some(front) = args.pop_front() {
@@ -255,7 +255,7 @@ impl<'lua, T: UserData> UserDataMethods<'lua, T> {
     where
         A: FromLuaMulti<'lua>,
         R: ToLuaMulti<'lua>,
-        M: 'static + Send + for<'a> FnMut(&'lua Lua, &'a mut T, A) -> Result<R>,
+        M: 'static + Send + FnMut(&'lua Lua, &mut T, A) -> Result<R>,
     {
         let method = RefCell::new(method);
         Box::new(move |lua, mut args| {