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error[E0499]: cannot borrow `thing` as mutable more than once at a time
--> $DIR/retain-resume-ref.rs:27:25
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LL | gen.as_mut().resume(&mut thing);
| ---------- first mutable borrow occurs here
LL | gen.as_mut().resume(&mut thing);
| ^^^^^^^^^^ second mutable borrow occurs here
LL |
LL | }
| - first borrow might be used here, when `gen` is dropped and runs the destructor for generator
error: aborting due to previous error
For more information about this error, try `rustc --explain E0499`.
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