error: captured variable cannot escape `FnMut` closure body --> $DIR/do-not-suggest-adding-move-when-closure-is-already-marked-as-move.rs:6:9 | LL | let mut vec: Vec = Vec::new(); | ------- variable defined here LL | let closure = move || { | - inferred to be a `FnMut` closure LL | vec.clear(); | --- variable captured here LL | let mut iter = vec.iter(); LL | move || { iter.next() } | ^^^^^^^^^^^^^^^^^^^^^^^ returns a closure that contains a reference to a captured variable, which then escapes the closure body | = note: `FnMut` closures only have access to their captured variables while they are executing... = note: ...therefore, they cannot allow references to captured variables to escape error: aborting due to 1 previous error