error[E0658]: may_dangle has unstable semantics and may be removed in the future (see issue #34761) --> $DIR/feature-gate-may-dangle.rs:6:13 | LL | unsafe impl<#[may_dangle] A> Drop for Pt { | ^^^^^^^^^^^^^ | = help: add #![feature(dropck_eyepatch)] to the crate attributes to enable error: aborting due to previous error For more information about this error, try `rustc --explain E0658`.