Don't include current rustc version string in feature removed help

The version string is difficult to properly normalize out, and removing
it isn't a huge deal (the user can query version info easily through
`rustc --version` or `cargo --version`).

The normalization options were all non-ideal:

- Per-test version string normalization is nasty to maintain, and we
  need to maintain `n` copies of it.
- Centralized compiletest normalization (with a directive opt-out) is
  also not ideal, because `cfg(version(..))` tests can't have those
  accidentally normalized out (and you'd have to remember to opt-out).

compiler/rustc_expand/messages.ftl

@@ -62,7 +62,7 @@ expand_feature_not_allowed =
 expand_feature_removed =
     feature has been removed
     .label = feature has been removed
-    .note = removed in {$removed_rustc_version} (you are using {$current_rustc_version}){$pull_note}
+    .note = removed in {$removed_rustc_version}{$pull_note}
     .reason = {$reason}
 
 expand_glob_delegation_outside_impls =

compiler/rustc_expand/src/config.rs

@@ -92,7 +92,6 @@ pub fn features(sess: &Session, krate_attrs: &[Attribute], crate_name: Symbol) -
                     span: mi.span(),
                     reason: f.reason.map(|reason| FeatureRemovedReason { reason }),
                     removed_rustc_version: f.feature.since,
-                    current_rustc_version: sess.cfg_version,
                     pull_note,
                 });
                 continue;

compiler/rustc_expand/src/errors.rs

@@ -162,7 +162,6 @@ pub(crate) struct FeatureRemoved<'a> {
     #[subdiagnostic]
     pub reason: Option<FeatureRemovedReason<'a>>,
     pub removed_rustc_version: &'a str,
-    pub current_rustc_version: &'a str,
     pub pull_note: String,
 }
 

tests/ui/deprecation/deprecated_no_stack_check.rs

@@ -1,5 +1,3 @@
-//@ normalize-stderr: "you are using [0-9]+\.[0-9]+\.[0-9]+(-[a-zA-Z0-9.]+)?( \([^)]*\))?" -> "you are using $$RUSTC_VERSION"
-
 #![deny(warnings)]
 #![feature(no_stack_check)]
 //~^ ERROR: feature has been removed [E0557]

tests/ui/deprecation/deprecated_no_stack_check.stderr

@@ -1,10 +1,10 @@
 error[E0557]: feature has been removed
-  --> $DIR/deprecated_no_stack_check.rs:4:12
+  --> $DIR/deprecated_no_stack_check.rs:2:12
    |
 LL | #![feature(no_stack_check)]
    |            ^^^^^^^^^^^^^^ feature has been removed
    |
-   = note: removed in 1.0.0 (you are using $RUSTC_VERSION); see <https://github.com/rust-lang/rust/pull/40110> for more information
+   = note: removed in 1.0.0; see <https://github.com/rust-lang/rust/pull/40110> for more information
 
 error: aborting due to 1 previous error
 

tests/ui/feature-gates/feature-gate-coverage-attribute.rs

@@ -1,5 +1,3 @@
-//@ normalize-stderr: "you are using [0-9]+\.[0-9]+\.[0-9]+(-[a-zA-Z0-9.]+)?( \([^)]*\))?" -> "you are using $$RUSTC_VERSION"
-
 #![crate_type = "lib"]
 #![feature(no_coverage)] //~ ERROR feature has been removed [E0557]
 

tests/ui/feature-gates/feature-gate-coverage-attribute.stderr

@@ -1,14 +1,14 @@
 error[E0557]: feature has been removed
-  --> $DIR/feature-gate-coverage-attribute.rs:4:12
+  --> $DIR/feature-gate-coverage-attribute.rs:2:12
    |
 LL | #![feature(no_coverage)]
    |            ^^^^^^^^^^^ feature has been removed
    |
-   = note: removed in 1.74.0 (you are using $RUSTC_VERSION); see <https://github.com/rust-lang/rust/pull/114656> for more information
+   = note: removed in 1.74.0; see <https://github.com/rust-lang/rust/pull/114656> for more information
    = note: renamed to `coverage_attribute`
 
 error[E0658]: the `#[coverage]` attribute is an experimental feature
-  --> $DIR/feature-gate-coverage-attribute.rs:12:1
+  --> $DIR/feature-gate-coverage-attribute.rs:10:1
    |
 LL | #[coverage(off)]
    | ^^^^^^^^^^^^^^^^

tests/ui/feature-gates/gated-bad-feature.rs

@@ -1,4 +1,3 @@
-//@ normalize-stderr: "you are using [0-9]+\.[0-9]+\.[0-9]+(-[a-zA-Z0-9.]+)?( \([^)]*\))?" -> "you are using $$RUSTC_VERSION"
 #![feature(foo_bar_baz, foo(bar), foo = "baz", foo)]
 //~^ ERROR malformed `feature`
 //~| ERROR malformed `feature`

tests/ui/feature-gates/gated-bad-feature.stderr

@@ -1,43 +1,43 @@
 error[E0556]: malformed `feature` attribute input
-  --> $DIR/gated-bad-feature.rs:2:25
+  --> $DIR/gated-bad-feature.rs:1:25
    |
 LL | #![feature(foo_bar_baz, foo(bar), foo = "baz", foo)]
    |                         ^^^^^^^^ help: expected just one word: `foo`
 
 error[E0556]: malformed `feature` attribute input
-  --> $DIR/gated-bad-feature.rs:2:35
+  --> $DIR/gated-bad-feature.rs:1:35
    |
 LL | #![feature(foo_bar_baz, foo(bar), foo = "baz", foo)]
    |                                   ^^^^^^^^^^^ help: expected just one word: `foo`
 
 error[E0557]: feature has been removed
-  --> $DIR/gated-bad-feature.rs:9:12
+  --> $DIR/gated-bad-feature.rs:8:12
    |
 LL | #![feature(test_removed_feature)]
    |            ^^^^^^^^^^^^^^^^^^^^ feature has been removed
    |
-   = note: removed in 1.0.0 (you are using $RUSTC_VERSION)
+   = note: removed in 1.0.0
 
 error: malformed `feature` attribute input
-  --> $DIR/gated-bad-feature.rs:7:1
+  --> $DIR/gated-bad-feature.rs:6:1
    |
 LL | #![feature]
    | ^^^^^^^^^^^ help: must be of the form: `#![feature(name1, name2, ...)]`
 
 error: malformed `feature` attribute input
-  --> $DIR/gated-bad-feature.rs:8:1
+  --> $DIR/gated-bad-feature.rs:7:1
    |
 LL | #![feature = "foo"]
    | ^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#![feature(name1, name2, ...)]`
 
 error[E0635]: unknown feature `foo_bar_baz`
-  --> $DIR/gated-bad-feature.rs:2:12
+  --> $DIR/gated-bad-feature.rs:1:12
    |
 LL | #![feature(foo_bar_baz, foo(bar), foo = "baz", foo)]
    |            ^^^^^^^^^^^
 
 error[E0635]: unknown feature `foo`
-  --> $DIR/gated-bad-feature.rs:2:48
+  --> $DIR/gated-bad-feature.rs:1:48
    |
 LL | #![feature(foo_bar_baz, foo(bar), foo = "baz", foo)]
    |                                                ^^^

tests/ui/feature-gates/removed-features-note-version-and-pr-issue-141619.rs

@@ -1,5 +1,3 @@
-//@ normalize-stderr: "you are using [0-9]+\.[0-9]+\.[0-9]+(-[a-zA-Z0-9.]+)?( \([^)]*\))?" -> "you are using $$RUSTC_VERSION"
-
 #![feature(external_doc)] //~ ERROR feature has been removed
 #![doc(include("README.md"))] //~ ERROR unknown `doc` attribute `include`
 

tests/ui/feature-gates/removed-features-note-version-and-pr-issue-141619.stderr

@@ -1,14 +1,14 @@
 error[E0557]: feature has been removed
-  --> $DIR/removed-features-note-version-and-pr-issue-141619.rs:3:12
+  --> $DIR/removed-features-note-version-and-pr-issue-141619.rs:1:12
    |
 LL | #![feature(external_doc)]
    |            ^^^^^^^^^^^^ feature has been removed
    |
-   = note: removed in 1.54.0 (you are using $RUSTC_VERSION); see <https://github.com/rust-lang/rust/pull/85457> for more information
+   = note: removed in 1.54.0; see <https://github.com/rust-lang/rust/pull/85457> for more information
    = note: use #[doc = include_str!("filename")] instead, which handles macro invocations
 
 error: unknown `doc` attribute `include`
-  --> $DIR/removed-features-note-version-and-pr-issue-141619.rs:4:8
+  --> $DIR/removed-features-note-version-and-pr-issue-141619.rs:2:8
    |
 LL | #![doc(include("README.md"))]
    |        ^^^^^^^^^^^^^^^^^^^^

tests/ui/macros/macro-reexport-removed.rs

@@ -1,5 +1,4 @@
 //@ aux-build:two_macros.rs
-//@ normalize-stderr: "you are using [0-9]+\.[0-9]+\.[0-9]+(-[a-zA-Z0-9.]+)?( \([^)]*\))?" -> "you are using $$RUSTC_VERSION"
 
 #![feature(macro_reexport)] //~ ERROR feature has been removed
 

tests/ui/macros/macro-reexport-removed.stderr

@@ -1,14 +1,14 @@
 error[E0557]: feature has been removed
-  --> $DIR/macro-reexport-removed.rs:4:12
+  --> $DIR/macro-reexport-removed.rs:3:12
    |
 LL | #![feature(macro_reexport)]
    |            ^^^^^^^^^^^^^^ feature has been removed
    |
-   = note: removed in 1.0.0 (you are using $RUSTC_VERSION); see <https://github.com/rust-lang/rust/pull/49982> for more information
+   = note: removed in 1.0.0; see <https://github.com/rust-lang/rust/pull/49982> for more information
    = note: subsumed by `pub use`
 
 error: cannot find attribute `macro_reexport` in this scope
-  --> $DIR/macro-reexport-removed.rs:6:3
+  --> $DIR/macro-reexport-removed.rs:5:3
    |
 LL | #[macro_reexport(macro_one)]
    |   ^^^^^^^^^^^^^^ help: a built-in attribute with a similar name exists: `macro_export`

tests/ui/rustdoc/renamed-features-rustdoc_internals.rs

@@ -1,5 +1,3 @@
-//@ normalize-stderr: "you are using [0-9]+\.[0-9]+\.[0-9]+(-[a-zA-Z0-9.]+)?( \([^)]*\))?" -> "you are using $$RUSTC_VERSION"
-
 #![feature(doc_keyword)] //~ ERROR
 #![feature(doc_primitive)] //~ ERROR
 #![crate_type = "lib"]

tests/ui/rustdoc/renamed-features-rustdoc_internals.stderr

@@ -1,19 +1,19 @@
 error[E0557]: feature has been removed
-  --> $DIR/renamed-features-rustdoc_internals.rs:3:12
+  --> $DIR/renamed-features-rustdoc_internals.rs:1:12
    |
 LL | #![feature(doc_keyword)]
    |            ^^^^^^^^^^^ feature has been removed
    |
-   = note: removed in 1.58.0 (you are using $RUSTC_VERSION); see <https://github.com/rust-lang/rust/pull/90420> for more information
+   = note: removed in 1.58.0; see <https://github.com/rust-lang/rust/pull/90420> for more information
    = note: merged into `#![feature(rustdoc_internals)]`
 
 error[E0557]: feature has been removed
-  --> $DIR/renamed-features-rustdoc_internals.rs:4:12
+  --> $DIR/renamed-features-rustdoc_internals.rs:2:12
    |
 LL | #![feature(doc_primitive)]
    |            ^^^^^^^^^^^^^ feature has been removed
    |
-   = note: removed in 1.58.0 (you are using $RUSTC_VERSION); see <https://github.com/rust-lang/rust/pull/90420> for more information
+   = note: removed in 1.58.0; see <https://github.com/rust-lang/rust/pull/90420> for more information
    = note: merged into `#![feature(rustdoc_internals)]`
 
 error: aborting due to 2 previous errors

tests/ui/traits/const-traits/const-trait-impl-parameter-mismatch.rs

@@ -6,7 +6,6 @@
 // Regression test for issue #125877.
 
 //@ compile-flags: -Znext-solver
-//@ normalize-stderr: "you are using [0-9]+\.[0-9]+\.[0-9]+(-[a-zA-Z0-9.]+)?( \([^)]*\))?" -> "you are using $$RUSTC_VERSION"
 
 #![feature(const_trait_impl, effects)]
 //~^ ERROR feature has been removed

tests/ui/traits/const-traits/const-trait-impl-parameter-mismatch.stderr

@@ -1,14 +1,14 @@
 error[E0557]: feature has been removed
-  --> $DIR/const-trait-impl-parameter-mismatch.rs:11:30
+  --> $DIR/const-trait-impl-parameter-mismatch.rs:10:30
    |
 LL | #![feature(const_trait_impl, effects)]
    |                              ^^^^^^^ feature has been removed
    |
-   = note: removed in 1.84.0 (you are using $RUSTC_VERSION); see <https://github.com/rust-lang/rust/pull/132479> for more information
+   = note: removed in 1.84.0; see <https://github.com/rust-lang/rust/pull/132479> for more information
    = note: removed, redundant with `#![feature(const_trait_impl)]`
 
 error[E0049]: associated function `compute` has 0 type parameters but its trait declaration has 1 type parameter
-  --> $DIR/const-trait-impl-parameter-mismatch.rs:20:16
+  --> $DIR/const-trait-impl-parameter-mismatch.rs:19:16
    |
 LL |     fn compute<T: ~const Aux>() -> u32;
    |                - expected 1 type parameter

tests/ui/unsized-locals/yote.rs

@@ -1,4 +1,2 @@
-//@ normalize-stderr: "you are using [0-9]+\.[0-9]+\.[0-9]+(-[a-zA-Z0-9.]+)?( \([^)]*\))?" -> "you are using $$RUSTC_VERSION"
-
 #![feature(unsized_locals)] //~ERROR feature has been removed
 #![crate_type = "lib"]

tests/ui/unsized-locals/yote.stderr

@@ -1,10 +1,10 @@
 error[E0557]: feature has been removed
-  --> $DIR/yote.rs:3:12
+  --> $DIR/yote.rs:1:12
    |
 LL | #![feature(unsized_locals)]
    |            ^^^^^^^^^^^^^^ feature has been removed
    |
-   = note: removed in CURRENT_RUSTC_VERSION (you are using $RUSTC_VERSION)
+   = note: removed in CURRENT_RUSTC_VERSION
    = note: removed due to implementation concerns; see https://github.com/rust-lang/rust/issues/111942
 
 error: aborting due to 1 previous error