1 error[E0502]: cannot borrow `r.r2_union.f3_union` (via `r.r2_union.f3_union.s2_leaf.l1_u8`) as immutable because it is also borrowed as mutable (via `r.r2_union.f3_union.s1_leaf.l1_u8`)
2 --> $DIR/issue-57100.rs:42:20
4 LL | let mref = &mut r.r2_union.f3_union.s1_leaf.l1_u8;
5 | -------------------------------------- mutable borrow occurs here (via `r.r2_union.f3_union.s1_leaf.l1_u8`)
7 LL | let nref = &r.r2_union.f3_union.s2_leaf.l1_u8;
8 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ immutable borrow of `r.r2_union.f3_union.s2_leaf.l1_u8` -- which overlaps with `r.r2_union.f3_union.s1_leaf.l1_u8` -- occurs here
10 LL | println!("{} {}", mref, nref)
11 | ---- mutable borrow later used here
13 = note: `r.r2_union.f3_union.s2_leaf.l1_u8` is a field of the union `Second`, so it overlaps the field `r.r2_union.f3_union.s1_leaf.l1_u8`
15 error[E0502]: cannot borrow `r.r2_union` (via `r.r2_union.f1_leaf.l1_u8`) as immutable because it is also borrowed as mutable (via `r.r2_union.f2_leaf.l1_u8`)
16 --> $DIR/issue-57100.rs:60:20
18 LL | let mref = &mut r.r2_union.f2_leaf.l1_u8;
19 | ----------------------------- mutable borrow occurs here (via `r.r2_union.f2_leaf.l1_u8`)
21 LL | let nref = &r.r2_union.f1_leaf.l1_u8;
22 | ^^^^^^^^^^^^^^^^^^^^^^^^^ immutable borrow of `r.r2_union.f1_leaf.l1_u8` -- which overlaps with `r.r2_union.f2_leaf.l1_u8` -- occurs here
24 LL | println!("{} {}", mref, nref)
25 | ---- mutable borrow later used here
27 = note: `r.r2_union.f1_leaf.l1_u8` is a field of the union `First`, so it overlaps the field `r.r2_union.f2_leaf.l1_u8`
29 error: aborting due to 2 previous errors
31 For more information about this error, try `rustc --explain E0502`.