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