| error: captured variable cannot escape `FnMut` closure body |
| --> $DIR/regions-return-ref-to-upvar-issue-17403.rs:7:24 |
| | |
| LL | let mut x = 0; |
| | ----- variable defined here |
| LL | let mut f = || &mut x; |
| | - ^^^^^- |
| | | | | |
| | | | variable captured here |
| | | returns a reference to a captured variable which escapes the closure body |
| | inferred to be a `FnMut` closure |
| | |
| = 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 previous error |
| |
