error[E0277]: the type `std::cell::UnsafeCell<()>` may contain interior mutability and a reference may not be safely transferrable across a catch_unwind boundary --> $DIR/lua_norefunwindsafe.rs:7:5 | 7 | catch_unwind(|| lua.create_table().unwrap()); | ^^^^^^^^^^^^ `std::cell::UnsafeCell<()>` may contain interior mutability and a reference may not be safely transferrable across a catch_unwind boundary | = help: within `mlua::lua::Lua`, the trait `std::panic::RefUnwindSafe` is not implemented for `std::cell::UnsafeCell<()>` = note: required because it appears within the type `std::marker::PhantomData>` = note: required because it appears within the type `mlua::lua::Lua` = note: required because of the requirements on the impl of `std::panic::UnwindSafe` for `&mlua::lua::Lua` = note: required because it appears within the type `[closure@$DIR/tests/compile/lua_norefunwindsafe.rs:7:18: 7:48 lua:&mlua::lua::Lua]`