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error[E0596]: cannot borrow `*x.1` as mutable, as it is behind a `&` reference
--> $DIR/issue-61623.rs:6:19
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LL | f2(|| x.0, f1(x.1))
| ^^^ `x` is a `&` reference, so the data it refers to cannot be borrowed as mutable
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help: consider changing this to be a mutable reference
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LL | fn f3<'a>(x: &'a mut ((), &'a mut ())) {
| +++
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0596`.
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