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error[E0501]: cannot borrow `x` as immutable because previous closure requires unique access
--> $DIR/yield-while-ref-reborrowed.rs:36:20
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LL | let mut b = || {
| -- coroutine construction occurs here
LL | let a = &mut *x;
| -- first borrow occurs due to use of `x` in coroutine
...
LL | println!("{}", x);
| ^ second borrow occurs here
LL | Pin::new(&mut b).resume(());
| ------ first borrow later used here
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= note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0501`.
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