warning: unexpected `cfg` condition value
  --> $DIR/empty-values.rs:6:7
   |
LL | #[cfg(test = "value")]
   |       ^^^^----------
   |           |
   |           help: remove the value
   |
   = note: `#[warn(unexpected_cfgs)]` on by default
   = note: no expected value for `test`

warning: 1 warning emitted