note: no external requirements --> $DIR/escape-argument.rs:26:38 | LL | let mut closure = expect_sig(|p, y| *p = y); | ^^^^^^ | = note: defining type: test::{closure#0} with closure substs [ i16, for extern "rust-call" fn((&ReLateBound(DebruijnIndex(0), BoundRegion { var: 0, kind: BrAnon(None) }) mut &ReLateBound(DebruijnIndex(0), BoundRegion { var: 1, kind: BrAnon(None) }) i32, &ReLateBound(DebruijnIndex(0), BoundRegion { var: 1, kind: BrAnon(None) }) i32)), (), ] note: no external requirements --> $DIR/escape-argument.rs:20:1 | LL | fn test() { | ^^^^^^^^^ | = note: defining type: test error[E0597]: `y` does not live long enough --> $DIR/escape-argument.rs:27:25 | LL | let y = 22; | - binding `y` declared here LL | let mut closure = expect_sig(|p, y| *p = y); LL | closure(&mut p, &y); | ^^ borrowed value does not live long enough LL | LL | } | - `y` dropped here while still borrowed LL | LL | deref(p); | - borrow later used here error: aborting due to previous error For more information about this error, try `rustc --explain E0597`.