Rollup merge of #138242 - tshepang:that-stage0-has-arrived, r=jieyouxu

Revert "Don't test new error messages with the stage 0 compiler"

Author: matthiaskrgr

tests/ui-fulldeps/hash-stable-is-unstable.rs

@@ -1,4 +1,3 @@
-//@ ignore-stage1 FIXME: this line can be removed once these new error messages are in stage 0 rustc
 //@ compile-flags: -Zdeduplicate-diagnostics=yes
 extern crate rustc_data_structures;
 //~^ use of unstable library feature `rustc_private`

tests/ui-fulldeps/hash-stable-is-unstable.stderr

@@ -1,5 +1,5 @@
 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
+  --> $DIR/hash-stable-is-unstable.rs:2:1
    |
 LL | extern crate rustc_data_structures;
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -9,7 +9,7 @@ LL | extern crate rustc_data_structures;
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date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
+  --> $DIR/hash-stable-is-unstable.rs:6:1
    |
 LL | extern crate rustc_macros;
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -19,7 +19,7 @@ LL | extern crate rustc_macros;
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date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
+  --> $DIR/hash-stable-is-unstable.rs:10:1
    |
 LL | extern crate rustc_query_system;
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -29,7 +29,7 @@ LL | extern crate rustc_query_system;
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date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
+  --> $DIR/hash-stable-is-unstable.rs:15:5
    |
 LL | use rustc_macros::HashStable;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^
@@ -39,7 +39,7 @@ LL | use rustc_macros::HashStable;
    = 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
+  --> $DIR/hash-stable-is-unstable.rs:20:10
    |
 LL | #[derive(HashStable)]
    |          ^^^^^^^^^^

tests/ui-fulldeps/pathless-extern-unstable.rs

@@ -1,4 +1,3 @@
-//@ ignore-stage1 FIXME: this line can be removed once these new error messages are in stage 0 rustc
 //@ edition:2018
 //@ compile-flags:--extern rustc_middle
 

tests/ui-fulldeps/pathless-extern-unstable.stderr

@@ -1,5 +1,5 @@
 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/pathless-extern-unstable.rs:7:9
+  --> $DIR/pathless-extern-unstable.rs:6:9
    |
 LL | pub use rustc_middle;
    |         ^^^^^^^^^^^^