error: unneeded sub `cfg` when there is no condition
  --> $DIR/non_minimal_cfg2.rs:3:7
   |
LL | #[cfg(all())]
   |       ^^^^^
   |
   = note: `-D clippy::non-minimal-cfg` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::non_minimal_cfg)]`

error: aborting due to 1 previous error