1 error[E0658]: transparent unions are unstable
2 --> $DIR/feature-gate-transparent_unions.rs:2:1
4 LL | / union OkButUnstableUnion {
10 = note: for more information, see https://github.com/rust-lang/rust/issues/60405
11 = help: add #![feature(transparent_unions)] to the crate attributes to enable
13 error: aborting due to previous error
15 For more information about this error, try `rustc --explain E0658`.