1 error[E0658]: transparent unions are unstable
2 --> $DIR/feature-gate-transparent_unions.rs:2:1
4 LL | union OkButUnstableUnion {
5 | ^^^^^^^^^^^^^^^^^^^^^^^^
7 = note: see issue #60405 <https://github.com/rust-lang/rust/issues/60405> for more information
8 = help: add `#![feature(transparent_unions)]` to the crate attributes to enable
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0658`.