error[E0658]: use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead? --> $DIR/hash-stable-is-unstable.rs:3:1 | LL | extern crate rustc_data_structures; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: see issue #27812 for more information = help: add `#![feature(rustc_private)]` to the crate attributes to enable error[E0658]: use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead? --> $DIR/hash-stable-is-unstable.rs:5:1 | LL | extern crate rustc_macros; | ^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: see issue #27812 for more information = help: add `#![feature(rustc_private)]` to the crate attributes to enable error[E0658]: use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead? --> $DIR/hash-stable-is-unstable.rs:7:1 | LL | extern crate rustc_query_system; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: see issue #27812 for more information = help: add `#![feature(rustc_private)]` to the crate attributes to enable error[E0658]: use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead? --> $DIR/hash-stable-is-unstable.rs:10:5 | LL | use rustc_macros::HashStable; | ^^^^^^^^^^^^^^^^^^^^^^^^ | = note: see issue #27812 for more information = help: add `#![feature(rustc_private)]` to the crate attributes to enable error[E0658]: use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead? --> $DIR/hash-stable-is-unstable.rs:13:10 | LL | #[derive(HashStable)] | ^^^^^^^^^^ | = note: see issue #27812 for more information = help: add `#![feature(rustc_private)]` to the crate attributes to enable = note: this error originates in the derive macro `HashStable` (in Nightly builds, run with -Z macro-backtrace for more info) error: aborting due to 5 previous errors For more information about this error, try `rustc --explain E0658`.