error: this creates an owned instance just for comparison
  --> $DIR/comparison_flip.rs:6:8
   |
LL |     if a.to_string() != "bar" {
   |        ^^^^^^^^^^^^^ help: try: `a`
   |
   = note: `-D clippy::cmp-owned` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::cmp_owned)]`

error: this creates an owned instance just for comparison
  --> $DIR/comparison_flip.rs:10:17
   |
LL |     if "bar" != a.to_string() {
   |        ---------^^^^^^^^^^^^^
   |        |
   |        help: try: `a != "bar"`

error: aborting due to 2 previous errors