error[E0597]: `var` does not live long enough
  --> tests/async_compile_fail/captured_variable_spawn.rs:8:19
   |
7  |     let mut var = 1u32;
   |         ------- binding `var` declared here
8  |     let var_ref = &mut var;
   |                   ^^^^^^^^ borrowed value does not live long enough
...
13 |         ctx.globals().set("t",func).unwrap();
   |         --------------------------- argument requires that `var` is borrowed for `'static`
...
16 | }
   | - `var` dropped here while still borrowed