| error: captured variable cannot escape `FnMut` closure body | |
| --> $DIR/regions-return-ref-to-upvar-issue-17403.rs:7:24 | |
| | | |
| LL | let mut f = || &mut x; | |
| | - ^^^^^^ 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 | |