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1 error: captured variable cannot escape `FnMut` closure body
2   --> $DIR/issue-40510-3.rs:11:9
3    |
4 LL |       || {
5    |        - inferred to be a `FnMut` closure
6 LL | /         || {
7 LL | |             x.push(())
8 LL | |         }
9    | |_________^ returns a closure that contains a reference to a captured variable, which then escapes the closure body
10    |
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
13
14 error: aborting due to previous error
15