error[E0658]: unsafe_destructor_blind_to_params has been replaced by may_dangle and will be removed in the future (see issue #28498)
  --> $DIR/feature-gate-dropck-ugeh.rs:29:5
   |
LL |     #[unsafe_destructor_blind_to_params] // This is the UGEH attribute
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: add #![feature(dropck_parametricity)] to the crate attributes to enable

error: aborting due to previous error

For more information about this error, try `rustc --explain E0658`.