error[E0521]: borrowed data escapes outside of closure
  --> $DIR/scope_callback_outer.rs:7:17
   |
6  |       lua.scope(|scope| {
   |                  -----
   |                  |
   |                  `scope` declared here, outside of the closure body
   |                  `scope` is a reference that is only valid in the closure body
7  |           let f = scope
   |  _________________^
8  | |             .create_function_mut(|_, t: Table| {
9  | |                 outer = Some(t);
10 | |                 Ok(())
11 | |             })?;
   | |______________^ `scope` escapes the closure body here

error[E0597]: `outer` does not live long enough
  --> $DIR/scope_callback_outer.rs:9:17
   |
6  |     lua.scope(|scope| {
   |               ------- value captured here
...
9  |                 outer = Some(t);
   |                 ^^^^^ borrowed value does not live long enough
...
15 | }
   | -
   | |
   | `outer` dropped here while still borrowed
   | borrow might be used here, when `outer` is dropped and runs the destructor for type `std::option::Option<mlua::table::Table<'_>>`