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error[E0502]: cannot borrow `*map` as mutable because it is also borrowed as immutable
--> $DIR/get_default.rs:35:17
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LL | fn err(map: &mut Map) -> &String {
| - let's call the lifetime of this reference `'1`
LL | loop {
LL | match map.get() {
| --- immutable borrow occurs here
LL | Some(v) => {
LL | map.set(String::new()); // We always expect an error here.
| ^^^^^^^^^^^^^^^^^^^^^^ mutable borrow occurs here
LL |
LL | return v;
| - returning this value requires that `*map` is borrowed for `'1`
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0502`.
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