1error[E0658]: use of unstable library feature 'core_intrinsics': intrinsics are unlikely to ever be stabilized, instead they should be used through stabilized interfaces in the rest of the standard library 2 --> $DIR/unchecked_math_unstable.rs:4:19 3 | 4LL | let add = std::intrinsics::unchecked_add(x, y); 5 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 6 | 7 = help: add `#![feature(core_intrinsics)]` to the crate attributes to enable 8 9error[E0658]: use of unstable library feature 'core_intrinsics': intrinsics are unlikely to ever be stabilized, instead they should be used through stabilized interfaces in the rest of the standard library 10 --> $DIR/unchecked_math_unstable.rs:5:19 11 | 12LL | let sub = std::intrinsics::unchecked_sub(x, y); 13 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 14 | 15 = help: add `#![feature(core_intrinsics)]` to the crate attributes to enable 16 17error[E0658]: use of unstable library feature 'core_intrinsics': intrinsics are unlikely to ever be stabilized, instead they should be used through stabilized interfaces in the rest of the standard library 18 --> $DIR/unchecked_math_unstable.rs:6:19 19 | 20LL | let mul = std::intrinsics::unchecked_mul(x, y); 21 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 22 | 23 = help: add `#![feature(core_intrinsics)]` to the crate attributes to enable 24 25error: aborting due to 3 previous errors 26 27For more information about this error, try `rustc --explain E0658`. 28