1 error: captured variable cannot escape `FnMut` closure body
2 --> $DIR/issue-40510-3.rs:11:9
5 | - inferred to be a `FnMut` closure
9 | |_________^ returns a closure that contains a reference to a captured variable, which then escapes the closure body
11 = note: `FnMut` closures only have access to their captured variables while they are executing...
12 = note: ...therefore, they cannot allow references to captured variables to escape
14 error: aborting due to previous error