extern crate rlua; use std::panic::catch_unwind; use rlua::*; fn main() { let lua = Lua::new(); let _ = catch_unwind(|| lua.create_table().unwrap()); //~^ error: the type `std::cell::UnsafeCell<()>` may contain interior mutability and a reference // may not be safely transferrable across a catch_unwind boundary }