warning: unexpected `cfg` condition value: `invalid`
  --> $DIR/check-cfg-test.rs:9:7
   |
LL | #[cfg(feature = "invalid")]
   |       ^^^^^^^^^^^^^^^^^^^
   |
   = note: expected values for `feature` are: `test`
   = note: `#[warn(unexpected_cfgs)]` on by default

warning: 1 warning emitted