| error[E0502]: cannot borrow `*map` as mutable because it is also borrowed as immutable |
| --> $DIR/get_default.rs:32:17 |
| | |
| 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()); // Both AST and MIR error here |
| | ^^^ mutable borrow occurs here |
| LL | |
| LL | return v; |
| | - returning this value requires that `*map` is borrowed for `'1` |
| |
| error: aborting due to previous error |
| |
| For more information about this error, try `rustc --explain E0502`. |
