Extern "Lua" functions should be able to act as constructors

crates/luaffi_impl/src/metatype.rs

@@ -688,11 +688,6 @@ fn parse_lua_function_attrs(attrs: &mut Vec<Attribute>) -> Result<LuaFunctionAtt
         if let Some(name) = attr.path().get_ident()
             && let Ok(method) = Metamethod::try_from(&name.unraw())
         {
-            match method {
-                Metamethod::New => syn_error!(attr, r#"cannot be applied to a lua function"#),
-                _ => {}
-            }
-
             parsed.metamethod = Some(method);
             attrs.remove(i);
         } else {