error[E0597]: `b` does not live long enough --> $DIR/var-appears-twice.rs:20:38 | LL | let b = 44; | - binding `b` declared here ... LL | let x: DoubleCell<_> = make_cell(&b); | ------------- ^^ borrowed value does not live long enough | | | type annotation requires that `b` is borrowed for `'static` ... LL | } | - `b` dropped here while still borrowed error: aborting due to previous error For more information about this error, try `rustc --explain E0597`.