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error[E0373]: closure may outlive the current function, but it borrows `books`, which is owned by the current function
--> $DIR/borrowck-escaping-closure-error-2.rs:11:14
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LL | Box::new(|| books.push(4))
| ^^ ----- `books` is borrowed here
| |
| may outlive borrowed value `books`
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note: closure is returned here
--> $DIR/borrowck-escaping-closure-error-2.rs:11:5
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LL | Box::new(|| books.push(4))
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
help: to force the closure to take ownership of `books` (and any other referenced variables), use the `move` keyword
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LL | Box::new(move || books.push(4))
| ++++
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0373`.
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