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error: captured variable cannot escape `FnMut` closure body
--> $DIR/issue-40510-1.rs:7:9
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LL | let mut x: Box<()> = Box::new(());
| ----- variable defined here
LL |
LL | || {
| - inferred to be a `FnMut` closure
LL | &mut x
| ^^^^^-
| | |
| | variable captured here
| returns a reference to a captured variable which escapes the closure body
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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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