error: unused variable: `x`
  --> $DIR/lint-group-forbid-always-trumps-cli.rs:5:9
   |
LL |     let x = 1;
   |         ^ help: if this is intentional, prefix it with an underscore: `_x`
   |
   = note: `-F unused-variables` implied by `-F unused`

error: aborting due to previous error