| // ignore-tidy-linelength |
| |
| #[derive(Clone, Copy)] |
| union U { |
| a: u8, |
| b: u64, |
| } |
| |
| fn main() { |
| unsafe { |
| let mut u = U { b: 0 }; |
| // Imm borrow, same field |
| { |
| let ra = &u.a; |
| let ra2 = &u.a; // OK |
| drop(ra); |
| } |
| { |
| let ra = &u.a; |
| let a = u.a; // OK |
| drop(ra); |
| } |
| { |
| let ra = &u.a; |
| let rma = &mut u.a; //~ ERROR cannot borrow `u.a` as mutable because it is also borrowed as immutable |
| drop(ra); |
| } |
| { |
| let ra = &u.a; |
| u.a = 1; //~ ERROR cannot assign to `u.a` because it is borrowed |
| drop(ra); |
| } |
| // Imm borrow, other field |
| { |
| let ra = &u.a; |
| let rb = &u.b; // OK |
| drop(ra); |
| } |
| { |
| let ra = &u.a; |
| let b = u.b; // OK |
| drop(ra); |
| } |
| { |
| let ra = &u.a; |
| let rmb = &mut u.b; //~ ERROR cannot borrow `u` (via `u.b`) as mutable because it is also borrowed as immutable (via `u.a`) |
| drop(ra); |
| } |
| { |
| let ra = &u.a; |
| u.b = 1; //~ ERROR cannot assign to `u.b` because it is borrowed |
| drop(ra); |
| } |
| // Mut borrow, same field |
| { |
| let rma = &mut u.a; |
| let ra = &u.a; //~ ERROR cannot borrow `u.a` as immutable because it is also borrowed as mutable |
| drop(rma); |
| } |
| { |
| let ra = &mut u.a; |
| let a = u.a; //~ ERROR cannot use `u.a` because it was mutably borrowed |
| drop(ra); |
| } |
| { |
| let rma = &mut u.a; |
| let rma2 = &mut u.a; //~ ERROR cannot borrow `u.a` as mutable more than once at a time |
| drop(rma); |
| } |
| { |
| let rma = &mut u.a; |
| u.a = 1; //~ ERROR cannot assign to `u.a` because it is borrowed |
| drop(rma); |
| } |
| // Mut borrow, other field |
| { |
| let rma = &mut u.a; |
| let rb = &u.b; //~ ERROR cannot borrow `u` (via `u.b`) as immutable because it is also borrowed as mutable (via `u.a`) |
| drop(rma); |
| } |
| { |
| let ra = &mut u.a; |
| let b = u.b; //~ ERROR cannot use `u.b` because it was mutably borrowed |
| |
| drop(ra); |
| } |
| { |
| let rma = &mut u.a; |
| let rmb2 = &mut u.b; //~ ERROR cannot borrow `u` (via `u.b`) as mutable more than once at a time |
| drop(rma); |
| } |
| { |
| let rma = &mut u.a; |
| u.b = 1; //~ ERROR cannot assign to `u.b` because it is borrowed |
| drop(rma); |
| } |
| } |
| } |