Seal LuaSerdeExt/TableExt/AnyUserDataExt

src/lib.rs

@@ -240,4 +240,7 @@ pub(crate) mod private {
 
     impl Sealed for Error {}
     impl<T> Sealed for std::result::Result<T, Error> {}
+    impl Sealed for Lua {}
+    impl Sealed for Table<'_> {}
+    impl Sealed for AnyUserData<'_> {}
 }

src/serde/mod.rs

@@ -8,6 +8,7 @@ use serde::{Deserialize, Serialize};
 use crate::error::Result;
 use crate::ffi;
 use crate::lua::Lua;
+use crate::private::Sealed;
 use crate::table::Table;
 use crate::types::LightUserData;
 use crate::util::check_stack;
@@ -15,7 +16,7 @@ use crate::value::Value;
 
 /// Trait for serializing/deserializing Lua values using Serde.
 #[cfg_attr(docsrs, doc(cfg(feature = "serialize")))]
-pub trait LuaSerdeExt<'lua> {
+pub trait LuaSerdeExt<'lua>: Sealed {
     /// A special value (lightuserdata) to encode/decode optional (none) values.
     ///
     /// Requires `feature = "serialize"`

src/table.rs

@@ -11,6 +11,7 @@ use {
 use crate::error::{Error, Result};
 use crate::ffi;
 use crate::function::Function;
+use crate::private::Sealed;
 use crate::types::{Integer, LuaRef};
 use crate::util::{assert_stack, check_stack, StackGuard};
 use crate::value::{FromLua, FromLuaMulti, IntoLua, IntoLuaMulti, Nil, Value};
@@ -753,7 +754,7 @@ impl<'lua> AsRef<Table<'lua>> for Table<'lua> {
 }
 
 /// An extension trait for `Table`s that provides a variety of convenient functionality.
-pub trait TableExt<'lua> {
+pub trait TableExt<'lua>: Sealed {
     /// Calls the table as function assuming it has `__call` metamethod.
     ///
     /// The metamethod is called with the table as its first argument, followed by the passed arguments.

src/userdata_ext.rs

@@ -1,4 +1,5 @@
 use crate::error::{Error, Result};
+use crate::private::Sealed;
 use crate::userdata::{AnyUserData, MetaMethod};
 use crate::value::{FromLua, FromLuaMulti, IntoLua, IntoLuaMulti, Value};
 
@@ -6,7 +7,7 @@ use crate::value::{FromLua, FromLuaMulti, IntoLua, IntoLuaMulti, Value};
 use {futures_core::future::LocalBoxFuture, futures_util::future};
 
 /// An extension trait for [`AnyUserData`] that provides a variety of convenient functionality.
-pub trait AnyUserDataExt<'lua> {
+pub trait AnyUserDataExt<'lua>: Sealed {
     /// Gets the value associated to `key` from the userdata, assuming it has `__index` metamethod.
     fn get<K: IntoLua<'lua>, V: FromLua<'lua>>(&self, key: K) -> Result<V>;