From fcab60bac449d1a86302d1ca2b54b1c58b59cf2b Mon Sep 17 00:00:00 2001
From: Alex Orlenko <zxteam@protonmail.com>
Date: Sun, 31 May 2026 12:28:06 +0100
Subject: [PATCH] mlua_derive: Fix `#[lua(meta, field)]` case

---
 mlua_derive/src/userdata/userdata_impl.rs |  2 +-
 tests/userdata_macro.rs                   | 13 ++++++++++++-
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/mlua_derive/src/userdata/userdata_impl.rs b/mlua_derive/src/userdata/userdata_impl.rs
index d082bb4..88f0d5a 100644
--- a/mlua_derive/src/userdata/userdata_impl.rs
+++ b/mlua_derive/src/userdata/userdata_impl.rs
@@ -356,7 +356,7 @@ pub fn userdata_impl(attr: TokenStream, item: TokenStream) -> TokenStream {
                     let lua_name = lua_attr.name(fn_name);
                     if lua_attr.meta {
                         let tokens = quote! {
-                            registry.add_meta_field(#lua_name, #type_path::#fn_name);
+                            registry.add_meta_field(#lua_name, #type_path::#fn_name());
                         };
                         registration_calls.push(with_cfg(tokens, &method.attrs));
                     } else {
diff --git a/tests/userdata_macro.rs b/tests/userdata_macro.rs
index 169c924..ec802f3 100644
--- a/tests/userdata_macro.rs
+++ b/tests/userdata_macro.rs
@@ -79,6 +79,11 @@ impl Rectangle {
         }
     }
 
+    #[lua(meta, field, name = "__answer")]
+    fn answer() -> u32 {
+        42
+    }
+
     #[lua(skip)]
     #[allow(unused)]
     fn helper() -> u32 {
@@ -124,7 +129,7 @@ impl Rectangle {
 }
 
 fn make_lua() -> Lua {
-    let lua = Lua::new();
+    let lua = unsafe { Lua::unsafe_new() };
     lua.globals()
         .set("Rectangle", lua.create_proxy::<Rectangle>().unwrap())
         .unwrap();
@@ -193,6 +198,12 @@ fn test_rectangle() {
         assert(other.length == 7, "other length should be 7 after transfer")
         assert(other:double_length() == 14, "double_length should be 14")
 
+        -- meta field
+        if _VERSION:match("Lua ") then
+            local mt = debug.getmetatable(rect)
+            assert(mt.__answer == 42, "__answer meta field should be 42")
+        end
+
         assert(rect.lua_version == _VERSION, "lua_version should match Lua's _VERSION")
 
         -- Consuming method