note: no external requirements --> $DIR/propagate-approximated-shorter-to-static-comparing-against-free.rs:21:15 | LL | foo(cell, |cell_a, cell_x| { | ^^^^^^^^^^^^^^^^ | = note: defining type: case1::{closure#0} with closure substs [ i32, for extern "rust-call" fn((std::cell::Cell<&'_#1r u32>, std::cell::Cell<&ReLateBound(DebruijnIndex(0), BoundRegion { var: 0, kind: BrAnon(None) }) u32>)), (), ] error[E0521]: borrowed data escapes outside of closure --> $DIR/propagate-approximated-shorter-to-static-comparing-against-free.rs:22:9 | LL | foo(cell, |cell_a, cell_x| { | ------ ------ `cell_x` is a reference that is only valid in the closure body | | | `cell_a` declared here, outside of the closure body LL | cell_a.set(cell_x.get()); // forces 'x: 'a, error in closure | ^^^^^^^^^^^^^^^^^^^^^^^^ `cell_x` escapes the closure body here note: no external requirements --> $DIR/propagate-approximated-shorter-to-static-comparing-against-free.rs:18:1 | LL | fn case1() { | ^^^^^^^^^^ | = note: defining type: case1 note: external requirements --> $DIR/propagate-approximated-shorter-to-static-comparing-against-free.rs:35:15 | LL | foo(cell, |cell_a, cell_x| { | ^^^^^^^^^^^^^^^^ | = note: defining type: case2::{closure#0} with closure substs [ i32, for extern "rust-call" fn((std::cell::Cell<&'_#1r u32>, std::cell::Cell<&ReLateBound(DebruijnIndex(0), BoundRegion { var: 0, kind: BrAnon(None) }) u32>)), (), ] = note: number of external vids: 2 = note: where '_#1r: '_#0r note: no external requirements --> $DIR/propagate-approximated-shorter-to-static-comparing-against-free.rs:28:1 | LL | fn case2() { | ^^^^^^^^^^ | = note: defining type: case2 error[E0597]: `a` does not live long enough --> $DIR/propagate-approximated-shorter-to-static-comparing-against-free.rs:30:26 | LL | let a = 0; | - binding `a` declared here LL | let cell = Cell::new(&a); | ^^ borrowed value does not live long enough ... LL | / foo(cell, |cell_a, cell_x| { LL | | cell_x.set(cell_a.get()); // forces 'a: 'x, implies 'a = 'static -> borrow error LL | | }) | |______- argument requires that `a` is borrowed for `'static` LL | } | - `a` dropped here while still borrowed error: aborting due to 2 previous errors Some errors have detailed explanations: E0521, E0597. For more information about an error, try `rustc --explain E0521`.