|  | error[E0310]: the parameter type `T` may not live long enough | 
|  | --> $DIR/liberated-region-from-outer-closure.rs:5:17 | 
|  | | | 
|  | LL |         move || needs_static_lifetime(x); | 
|  | |                 ^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | |                 | | 
|  | |                 the parameter type `T` must be valid for the static lifetime... | 
|  | |                 ...so that the type `T` will meet its required lifetime bounds | 
|  | | | 
|  | help: consider adding an explicit lifetime bound | 
|  | | | 
|  | LL | fn example<T: Copy + 'static>(x: T) -> impl FnMut(&mut ()) { | 
|  | |                    +++++++++ | 
|  |  | 
|  | error: aborting due to 1 previous error | 
|  |  | 
|  | For more information about this error, try `rustc --explain E0310`. |