1 error: captured variable cannot escape `FnMut` closure body
2 --> $DIR/issue-49824.rs:10:9
5 | - inferred to be a `FnMut` closure
10 LL | | let _y = &mut x;
12 | |_________^ returns a closure that contains a reference to a captured variable, which then escapes the closure body
14 = note: `FnMut` closures only have access to their captured variables while they are executing...
15 = note: ...therefore, they cannot allow references to captured variables to escape
17 error: aborting due to previous error