error: this looks like you are trying to swap `a` and `b`
  --> $DIR/no_std_swap.rs:12:5
   |
LL | /     a = b;
LL | |
LL | |
LL | |     b = a;
   | |_________^ help: try: `core::mem::swap(&mut a, &mut b)`
   |
   = note: or maybe you should use `core::mem::replace`?
   = note: `-D clippy::almost-swapped` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::almost_swapped)]`

error: aborting due to 1 previous error