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error: captured variable cannot escape `FnMut` closure body
--> $DIR/regions-return-ref-to-upvar-issue-17403.rs:7:24
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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
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= 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
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