error[E0658]: use of unstable library feature 'transmutability' --> $DIR/feature-missing.rs:5:5 | LL | use std::mem::BikeshedIntrinsicFrom; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: see issue #99571 for more information = help: add `#![feature(transmutability)]` to the crate attributes to enable error[E0658]: use of unstable library feature 'transmutability' --> $DIR/feature-missing.rs:8:5 | LL | use std::mem::Assume; | ^^^^^^^^^^^^^^^^ | = note: see issue #99571 for more information = help: add `#![feature(transmutability)]` to the crate attributes to enable error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0658`.