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 <https://github.com/rust-lang/rust/issues/27812> for more information
   = help: add `#![feature(rustc_private)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

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_macros;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #27812 <https://github.com/rust-lang/rust/issues/27812> for more information
   = help: add `#![feature(rustc_private)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

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:11:1
   |
LL | extern crate rustc_query_system;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #27812 <https://github.com/rust-lang/rust/issues/27812> for more information
   = help: add `#![feature(rustc_private)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

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:16:5
   |
LL | use rustc_macros::HashStable;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #27812 <https://github.com/rust-lang/rust/issues/27812> for more information
   = help: add `#![feature(rustc_private)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

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:21:10
   |
LL | #[derive(HashStable)]
   |          ^^^^^^^^^^
   |
   = note: see issue #27812 <https://github.com/rust-lang/rust/issues/27812> for more information
   = help: add `#![feature(rustc_private)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
   = 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`.