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error[E0502]: cannot borrow `u` (via `u.z.c`) as immutable because it is also borrowed as mutable (via `u.s.a`)
--> $DIR/issue-45157.rs:29:20
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LL | let mref = &mut u.s.a;
| ---------- mutable borrow occurs here (via `u.s.a`)
...
LL | let nref = &u.z.c;
| ^^^^^^ immutable borrow of `u.z.c` -- which overlaps with `u.s.a` -- occurs here
LL |
LL | println!("{} {}", mref, nref)
| ---- mutable borrow later used here
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= note: `u.z.c` is a field of the union `U`, so it overlaps the field `u.s.a`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0502`.
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