error: use of a disallowed/placeholder name `foo`
  --> $DIR/disallowed_names.rs:5:9
   |
LL |     let foo = "bar";
   |         ^^^
   |
   = note: `-D clippy::disallowed-names` implied by `-D warnings`

error: use of a disallowed/placeholder name `ducks`
  --> $DIR/disallowed_names.rs:7:9
   |
LL |     let ducks = ["quack", "quack"];
   |         ^^^^^

error: aborting due to 2 previous errors