error: Can not run on Unions! Cylinder only works on enums
 --> tests/failures/unions_fail.rs:6:10
  |
6 | #[derive(CylinerBuildU8)]
  |          ^^^^^^^^^^^^^^
  |
  = note: this error originates in the derive macro `CylinerBuildU8` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0601]: `main` function not found in crate `$CRATE`
  --> tests/failures/unions_fail.rs:10:2
   |
10 | }
   |  ^ consider adding a `main` function to `$DIR/tests/failures/unions_fail.rs`