diff --git a/src/scope.rs b/src/scope.rs
index 640886f..70d6116 100644
--- a/src/scope.rs
+++ b/src/scope.rs
@@ -34,13 +34,14 @@ use {
 /// See [`Lua::scope`] for more details.
 ///
 /// [`Lua::scope`]: struct.Lua.html#method.scope
-#[allow(clippy::type_complexity)]
 pub struct Scope<'lua, 'scope> {
     lua: &'lua Lua,
-    destructors: RefCell<Vec<(LuaRef<'lua>, Box<dyn Fn(LuaRef<'lua>) -> Vec<Box<dyn Any>> + 'lua>)>>,
+    destructors: RefCell<Vec<(LuaRef<'lua>, DestructorCallback<'lua>)>>,
     _scope_invariant: PhantomData<Cell<&'scope ()>>,
 }
 
+type DestructorCallback<'lua> = Box<dyn Fn(LuaRef<'lua>) -> Vec<Box<dyn Any>> + 'lua>;
+
 impl<'lua, 'scope> Scope<'lua, 'scope> {
     pub(crate) fn new(lua: &'lua Lua) -> Scope<'lua, 'scope> {
         Scope {
@@ -184,7 +185,7 @@ impl<'lua, 'scope> Scope<'lua, 'scope> {
 
             #[cfg(any(feature = "lua51", feature = "luajit"))]
             let newtable = self.lua.create_table()?;
-            self.destructors.borrow_mut().push((ud.0.clone(), Box::new(move |u| {
+            let destructor: DestructorCallback = Box::new(move |u| {
                 let state = u.lua.state;
                 assert_stack(state, 2);
                 u.lua.push_ref(&u);
@@ -199,7 +200,10 @@ impl<'lua, 'scope> Scope<'lua, 'scope> {
                 // We know the destructor has not run yet because we hold a reference to the
                 // userdata.
                 vec![Box::new(take_userdata::<UserDataCell<T>>(state))]
-            })));
+            });
+            self.destructors
+                .borrow_mut()
+                .push((ud.0.clone(), destructor));
 
             Ok(ud)
         }
@@ -399,7 +403,7 @@ impl<'lua, 'scope> Scope<'lua, 'scope> {
 
             #[cfg(any(feature = "lua51", feature = "luajit"))]
             let newtable = lua.create_table()?;
-            self.destructors.borrow_mut().push((ud.0.clone(), Box::new(move |ud| {
+            let destructor: DestructorCallback = Box::new(move |ud| {
                 // We know the destructor has not run yet because we hold a reference to the userdata.
                 let state = ud.lua.state;
                 assert_stack(state, 2);
@@ -419,7 +423,10 @@ impl<'lua, 'scope> Scope<'lua, 'scope> {
                 ffi::lua_setuservalue(state, -2);
 
                 vec![Box::new(take_userdata::<UserDataCell<()>>(state))]
-            })));
+            });
+            self.destructors
+                .borrow_mut()
+                .push((ud.0.clone(), destructor));
 
             Ok(ud)
         }
@@ -437,7 +444,7 @@ impl<'lua, 'scope> Scope<'lua, 'scope> {
         let f = mem::transmute::<Callback<'callback, 'scope>, Callback<'lua, 'static>>(f);
         let f = self.lua.create_callback(f)?;
 
-        self.destructors.borrow_mut().push((f.0.clone(), Box::new(|f| {
+        let destructor: DestructorCallback = Box::new(|f| {
             let state = f.lua.state;
             assert_stack(state, 3);
             f.lua.push_ref(&f);
@@ -456,7 +463,11 @@ impl<'lua, 'scope> Scope<'lua, 'scope> {
 
             ffi::lua_pop(state, 1);
             vec![Box::new(ud1), Box::new(ud2)]
-        })));
+        });
+        self.destructors
+            .borrow_mut()
+            .push((f.0.clone(), destructor));
+
         Ok(f)
     }
 
@@ -471,8 +482,7 @@ impl<'lua, 'scope> Scope<'lua, 'scope> {
         // We need to pre-allocate strings to avoid failures in destructor.
         let get_poll_str = self.lua.create_string("get_poll")?;
         let poll_str = self.lua.create_string("poll")?;
-
-        self.destructors.borrow_mut().push((f.0.clone(), Box::new(move |f| {
+        let destructor: DestructorCallback = Box::new(move |f| {
             let state = f.lua.state;
             assert_stack(state, 4);
             f.lua.push_ref(&f);
@@ -520,7 +530,10 @@ impl<'lua, 'scope> Scope<'lua, 'scope> {
             }
 
             data
-        })));
+        });
+        self.destructors
+            .borrow_mut()
+            .push((f.0.clone(), destructor));
 
         Ok(f)
     }
diff --git a/src/types.rs b/src/types.rs
index 79b6293..7621c43 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -1,4 +1,3 @@
-// OK
 use std::cell::RefCell;
 use std::os::raw::{c_int, c_void};
 use std::sync::{Arc, Mutex};
diff --git a/src/userdata.rs b/src/userdata.rs
index f3d01c9..a2082e7 100644
--- a/src/userdata.rs
+++ b/src/userdata.rs
@@ -1,4 +1,3 @@
-// OK
 use std::cell::{Ref, RefMut};
 use std::fmt;
 use std::hash::{Hash, Hasher};
diff --git a/src/util.rs b/src/util.rs
index cf351dc..e2c85ab 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -385,14 +385,6 @@ pub unsafe fn get_wrapped_error(state: *mut ffi::lua_State, index: c_int) -> *co
     &(*ud).0
 }
 
-#[no_mangle]
-pub unsafe extern "C" fn mlua_get_wrapped_error(
-    state: *mut ffi::lua_State,
-    index: c_int,
-) -> *const c_void {
-    get_wrapped_error(state, index) as *const c_void
-}
-
 // Initialize the internal (with __gc) metatable for a type T
 pub unsafe fn init_gc_metatable_for<T: Any>(
     state: *mut ffi::lua_State,
diff --git a/src/value.rs b/src/value.rs
index 082436e..ba2e13e 100644
--- a/src/value.rs
+++ b/src/value.rs
@@ -1,4 +1,3 @@
-// OK
 use std::iter::{self, FromIterator};
 use std::{slice, str, vec};