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error[E0502]: cannot borrow `foo` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-issue-49631.rs:20:9
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LL | while let Some(Ok(string)) = foo.get() {
| --------- immutable borrow occurs here
LL | foo.mutate();
| ^^^^^^^^^^^^ mutable borrow occurs here
LL |
LL | println!("foo={:?}", *string);
| ------- immutable borrow later used here
error: aborting due to previous error
For more information about this error, try `rustc --explain E0502`.
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