This is a missing argcheck, add it back in as a comment

Author: bobtfish

src/lbaselib.rs

@@ -166,7 +166,11 @@ unsafe extern "C" fn luaB_getmetatable(L: *mut lua_State) -> c_int {
 }
 
 unsafe extern "C" fn luaB_setmetatable(L: *mut lua_State) -> c_int {
+    let _t = lua_type(L, 2);
     luaL_checktype(L, 1, LUA_TTABLE);
+    // FIXME
+    //luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,
+    //    "nil or table expected");
     if luaL_getmetafield(L, 1, cstr!("__metatable")) != LUA_TNIL {
         luaL_error(L, cstr!("cannot change a protected metatable"));
     }