| error: captured variable cannot escape `FnMut` closure body |
| --> $DIR/issue-49824.rs:4:9 |
| | |
| LL | let mut x = 0; |
| | ----- variable defined here |
| LL | || { |
| | - inferred to be a `FnMut` closure |
| LL | / || { |
| LL | | |
| LL | | let _y = &mut x; |
| | | - variable captured here |
| LL | | } |
| | |_________^ 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 |
| help: consider adding 'move' keyword before the nested closure |
| | |
| LL | move || { |
| | ++++ |
| |
| error: aborting due to 1 previous error |
| |
