error[E0133]: mutation of layout constrained field is unsafe and requires unsafe function or block --> $DIR/ranged_ints2_const.rs:14:13 | LL | let y = &mut x.0; | ^^^^^^^^ mutation of layout constrained field | = note: mutating layout constrained fields cannot statically be checked for valid values error[E0658]: mutable references are not allowed in constant functions --> $DIR/ranged_ints2_const.rs:14:13 | LL | let y = &mut x.0; | ^^^^^^^^ | = note: see issue #57349 for more information = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable error[E0658]: mutable references are not allowed in constant functions --> $DIR/ranged_ints2_const.rs:21:22 | LL | let y = unsafe { &mut x.0 }; | ^^^^^^^^ | = note: see issue #57349 for more information = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable error[E0658]: mutable references are not allowed in constant functions --> $DIR/ranged_ints2_const.rs:27:22 | LL | unsafe { let y = &mut x.0; } | ^^^^^^^^ | = note: see issue #57349 for more information = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable error: aborting due to 4 previous errors Some errors have detailed explanations: E0133, E0658. For more information about an error, try `rustc --explain E0133`.