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error[E0499]: cannot borrow `my_struct.field` as mutable more than once at a time
--> $DIR/return_from_loop.rs:20:9
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LL | let value = &mut my_struct.field;
| -------------------- first mutable borrow occurs here
LL | loop {
LL | my_struct.field.push_str("Hello, world!");
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ second mutable borrow occurs here
LL |
LL | value.len();
| ----------- first borrow later used here
error: aborting due to previous error
For more information about this error, try `rustc --explain E0499`.
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