error[E0597]: `ibad` does not live long enough
  --> tests/compile/scope_userdata_borrow.rs:15:46
   |
11 |     lua.scope(|scope| {
   |                ----- has type `&mlua::Scope<'_, '1>`
...
14 |             let ibad = 42;
   |                 ---- binding `ibad` declared here
15 |             scope.create_userdata(MyUserData(&ibad)).unwrap();
   |             ---------------------------------^^^^^--
   |             |                                |
   |             |                                borrowed value does not live long enough
   |             argument requires that `ibad` is borrowed for `'1`
16 |         };
   |         - `ibad` dropped here while still borrowed
   |
note: requirement that the value outlives `'1` introduced here
  --> src/scope.rs
   |
   |         T: UserData + 'env,
   |                       ^^^^