Note the version and PR of removed features when using it

xizheyin · xizheyin · commit dc2d7f681a46 · 2025-05-27T21:55:15.000+08:00
Signed-off-by: xizheyin &lt;xizheyin@smail.nju.edu.cn&gt;
diff --git a/compiler/rustc_expand/messages.ftl b/compiler/rustc_expand/messages.ftl
@@ -62,6 +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}){$pull_note}
     .reason = {$reason}
 
 expand_glob_delegation_outside_impls =
diff --git a/compiler/rustc_expand/src/config.rs b/compiler/rustc_expand/src/config.rs
@@ -81,9 +81,24 @@ pub fn features(sess: &Session, krate_attrs: &[Attribute], crate_name: Symbol) -
 
             // If the enabled feature has been removed, issue an error.
             if let Some(f) = REMOVED_LANG_FEATURES.iter().find(|f| name == f.feature.name) {
+                let span = mi.span();
+                let reason = f.reason.map(|reason| FeatureRemovedReason { reason });
+                let removed_rustc_version = f.feature.since;
+                let current_rustc_version = sess.cfg_version;
+                let pull_note = if let Some(pull) = f.pull {
+                    format!(
+                        "; see <https://github.com/rust-lang/rust/pull/{}> for more information",
+                        pull
+                    )
+                } else {
+                    "".to_owned()
+                };
                 sess.dcx().emit_err(FeatureRemoved {
-                    span: mi.span(),
-                    reason: f.reason.map(|reason| FeatureRemovedReason { reason }),
+                    span,
+                    reason,
+                    removed_rustc_version,
+                    current_rustc_version,
+                    pull_note,
                 });
                 continue;
             }
diff --git a/compiler/rustc_expand/src/errors.rs b/compiler/rustc_expand/src/errors.rs
@@ -154,12 +154,16 @@ pub(crate) struct HelperAttributeNameInvalid {
 
 #[derive(Diagnostic)]
 #[diag(expand_feature_removed, code = E0557)]
+#[note]
 pub(crate) struct FeatureRemoved<'a> {
     #[primary_span]
     #[label]
     pub span: Span,
     #[subdiagnostic]
     pub reason: Option<FeatureRemovedReason<'a>>,
+    pub removed_rustc_version: &'a str,
+    pub current_rustc_version: &'a str,
+    pub pull_note: String,
 }
 
 #[derive(Subdiagnostic)]
diff --git a/compiler/rustc_feature/src/removed.rs b/compiler/rustc_feature/src/removed.rs
@@ -1,17 +1,29 @@
 //! List of the removed feature gates.
 
+use std::num::{NonZero, NonZeroU32};
+
 use rustc_span::sym;
 
 use super::{Feature, to_nonzero};
 
 pub struct RemovedFeature {
     pub feature: Feature,
     pub reason: Option<&'static str>,
+    pub pull: Option<NonZero<u32>>,
+}
+
+macro_rules! opt_nonzero_u32 {
+    () => {
+        None
+    };
+    ($val:expr) => {
+        Some(NonZeroU32::new($val).unwrap())
+    };
 }
 
 macro_rules! declare_features {
     ($(
-        $(#[doc = $doc:tt])* (removed, $feature:ident, $ver:expr, $issue:expr, $reason:expr),
+        $(#[doc = $doc:tt])* (removed, $feature:ident, $ver:expr, $issue:expr, $reason:expr $(, $pull:expr)?),
     )+) => {
         /// Formerly unstable features that have now been removed.
         pub static REMOVED_LANG_FEATURES: &[RemovedFeature] = &[
@@ -21,7 +33,8 @@ macro_rules! declare_features {
                     since: $ver,
                     issue: to_nonzero($issue),
                 },
-                reason: $reason
+                reason: $reason,
+                pull:  opt_nonzero_u32!($($pull)?),
             }),+
         ];
     };
@@ -120,7 +133,7 @@ declare_features! (
      Some("subsumed by `::foo::bar` paths")),
     /// Allows `#[doc(include = "some-file")]`.
     (removed, external_doc, "1.54.0", Some(44732),
-     Some("use #[doc = include_str!(\"filename\")] instead, which handles macro invocations")),
+     Some("use #[doc = include_str!(\"filename\")] instead, which handles macro invocations"), 85457),
     /// Allows using `#[ffi_returns_twice]` on foreign functions.
     (removed, ffi_returns_twice, "1.78.0", Some(58314),
      Some("being investigated by the ffi-unwind project group")),
diff --git a/tests/ui/deprecation/deprecated_no_stack_check.rs b/tests/ui/deprecation/deprecated_no_stack_check.rs
@@ -1,3 +1,5 @@
+//@ 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]
diff --git a/tests/ui/deprecation/deprecated_no_stack_check.stderr b/tests/ui/deprecation/deprecated_no_stack_check.stderr
@@ -1,8 +1,10 @@
 error[E0557]: feature has been removed
-  --> $DIR/deprecated_no_stack_check.rs:2:12
+  --> $DIR/deprecated_no_stack_check.rs:4:12
    |
 LL | #![feature(no_stack_check)]
    |            ^^^^^^^^^^^^^^ feature has been removed
+   |
+   = note: removed in 1.0.0 (you are using $RUSTC_VERSION)
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/feature-gates/feature-gate-coverage-attribute.rs b/tests/ui/feature-gates/feature-gate-coverage-attribute.rs
@@ -1,3 +1,5 @@
+//@ 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]
 
diff --git a/tests/ui/feature-gates/feature-gate-coverage-attribute.stderr b/tests/ui/feature-gates/feature-gate-coverage-attribute.stderr
@@ -1,13 +1,14 @@
 error[E0557]: feature has been removed
-  --> $DIR/feature-gate-coverage-attribute.rs:2:12
+  --> $DIR/feature-gate-coverage-attribute.rs:4:12
    |
 LL | #![feature(no_coverage)]
    |            ^^^^^^^^^^^ feature has been removed
    |
+   = note: removed in 1.74.0 (you are using $RUSTC_VERSION)
    = note: renamed to `coverage_attribute`
 
 error[E0658]: the `#[coverage]` attribute is an experimental feature
-  --> $DIR/feature-gate-coverage-attribute.rs:10:1
+  --> $DIR/feature-gate-coverage-attribute.rs:12:1
    |
 LL | #[coverage(off)]
    | ^^^^^^^^^^^^^^^^
diff --git a/tests/ui/feature-gates/gated-bad-feature.rs b/tests/ui/feature-gates/gated-bad-feature.rs
@@ -1,3 +1,4 @@
+//@ 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`
diff --git a/tests/ui/feature-gates/gated-bad-feature.stderr b/tests/ui/feature-gates/gated-bad-feature.stderr
@@ -1,41 +1,43 @@
 error[E0556]: malformed `feature` attribute input
-  --> $DIR/gated-bad-feature.rs:1:25
+  --> $DIR/gated-bad-feature.rs:2:25
    |
 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:1:35
+  --> $DIR/gated-bad-feature.rs:2:35
    |
 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:8:12
+  --> $DIR/gated-bad-feature.rs:9:12
    |
 LL | #![feature(test_removed_feature)]
    |            ^^^^^^^^^^^^^^^^^^^^ feature has been removed
+   |
+   = note: removed in 1.0.0 (you are using $RUSTC_VERSION)
 
 error: malformed `feature` attribute input
-  --> $DIR/gated-bad-feature.rs:6:1
+  --> $DIR/gated-bad-feature.rs:7:1
    |
 LL | #![feature]
    | ^^^^^^^^^^^ help: must be of the form: `#![feature(name1, name2, ...)]`
 
 error: malformed `feature` attribute input
-  --> $DIR/gated-bad-feature.rs:7:1
+  --> $DIR/gated-bad-feature.rs:8:1
    |
 LL | #![feature = "foo"]
    | ^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#![feature(name1, name2, ...)]`
 
 error[E0635]: unknown feature `foo_bar_baz`
-  --> $DIR/gated-bad-feature.rs:1:12
+  --> $DIR/gated-bad-feature.rs:2:12
    |
 LL | #![feature(foo_bar_baz, foo(bar), foo = "baz", foo)]
    |            ^^^^^^^^^^^
 
 error[E0635]: unknown feature `foo`
-  --> $DIR/gated-bad-feature.rs:1:48
+  --> $DIR/gated-bad-feature.rs:2:48
    |
 LL | #![feature(foo_bar_baz, foo(bar), foo = "baz", foo)]
    |                                                ^^^
diff --git a/tests/ui/feature-gates/removed-features-note-version-and-pr-issue-141619.rs b/tests/ui/feature-gates/removed-features-note-version-and-pr-issue-141619.rs
@@ -1,3 +1,5 @@
+//@ 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`
 
diff --git a/tests/ui/feature-gates/removed-features-note-version-and-pr-issue-141619.stderr b/tests/ui/feature-gates/removed-features-note-version-and-pr-issue-141619.stderr
@@ -1,13 +1,14 @@
 error[E0557]: feature has been removed
-  --> $DIR/removed-features-note-version-and-pr-issue-141619.rs:1:12
+  --> $DIR/removed-features-note-version-and-pr-issue-141619.rs:3:12
    |
 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: 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:2:8
+  --> $DIR/removed-features-note-version-and-pr-issue-141619.rs:4:8
    |
 LL | #![doc(include("README.md"))]
    |        ^^^^^^^^^^^^^^^^^^^^
diff --git a/tests/ui/macros/macro-reexport-removed.rs b/tests/ui/macros/macro-reexport-removed.rs
@@ -1,4 +1,5 @@
 //@ 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
 
diff --git a/tests/ui/macros/macro-reexport-removed.stderr b/tests/ui/macros/macro-reexport-removed.stderr
@@ -1,13 +1,14 @@
 error[E0557]: feature has been removed
-  --> $DIR/macro-reexport-removed.rs:3:12
+  --> $DIR/macro-reexport-removed.rs:4:12
    |
 LL | #![feature(macro_reexport)]
    |            ^^^^^^^^^^^^^^ feature has been removed
    |
+   = note: removed in 1.0.0 (you are using $RUSTC_VERSION)
    = note: subsumed by `pub use`
 
 error: cannot find attribute `macro_reexport` in this scope
-  --> $DIR/macro-reexport-removed.rs:5:3
+  --> $DIR/macro-reexport-removed.rs:6:3
    |
 LL | #[macro_reexport(macro_one)]
    |   ^^^^^^^^^^^^^^ help: a built-in attribute with a similar name exists: `macro_export`
diff --git a/tests/ui/rustdoc/renamed-features-rustdoc_internals.rs b/tests/ui/rustdoc/renamed-features-rustdoc_internals.rs
@@ -1,3 +1,5 @@
+//@ 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"]
diff --git a/tests/ui/rustdoc/renamed-features-rustdoc_internals.stderr b/tests/ui/rustdoc/renamed-features-rustdoc_internals.stderr
@@ -1,17 +1,19 @@
 error[E0557]: feature has been removed
-  --> $DIR/renamed-features-rustdoc_internals.rs:1:12
+  --> $DIR/renamed-features-rustdoc_internals.rs:3:12
    |
 LL | #![feature(doc_keyword)]
    |            ^^^^^^^^^^^ feature has been removed
    |
+   = note: removed in 1.28.0 (you are using $RUSTC_VERSION)
    = note: merged into `#![feature(rustdoc_internals)]`
 
 error[E0557]: feature has been removed
-  --> $DIR/renamed-features-rustdoc_internals.rs:2:12
+  --> $DIR/renamed-features-rustdoc_internals.rs:4:12
    |
 LL | #![feature(doc_primitive)]
    |            ^^^^^^^^^^^^^ feature has been removed
    |
+   = note: removed in 1.56.0 (you are using $RUSTC_VERSION)
    = note: merged into `#![feature(rustdoc_internals)]`
 
 error: aborting due to 2 previous errors
diff --git a/tests/ui/traits/const-traits/const-trait-impl-parameter-mismatch.rs b/tests/ui/traits/const-traits/const-trait-impl-parameter-mismatch.rs
@@ -6,6 +6,7 @@
 // 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
diff --git a/tests/ui/traits/const-traits/const-trait-impl-parameter-mismatch.stderr b/tests/ui/traits/const-traits/const-trait-impl-parameter-mismatch.stderr
@@ -1,13 +1,14 @@
 error[E0557]: feature has been removed
-  --> $DIR/const-trait-impl-parameter-mismatch.rs:10:30
+  --> $DIR/const-trait-impl-parameter-mismatch.rs:11:30
    |
 LL | #![feature(const_trait_impl, effects)]
    |                              ^^^^^^^ feature has been removed
    |
+   = note: removed in 1.84.0 (you are using $RUSTC_VERSION)
    = 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:19:16
+  --> $DIR/const-trait-impl-parameter-mismatch.rs:20:16
    |
 LL |     fn compute<T: ~const Aux>() -> u32;
    |                - expected 1 type parameter

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,5 @@`
	`1`	`+//@ normalize-stderr: "you are using [0-9]+\.[0-9]+\.[0-9]+(-[a-zA-Z0-9]+)?" -> "you are using $$RUSTC_VERSION"`
	`2`	`+`
`1`	`3`	`#![deny(warnings)]`
`2`	`4`	`#![feature(no_stack_check)]`
`3`	`5`	`//~^ ERROR: feature has been removed [E0557]`
Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,5 @@`
	`1`	`+//@ normalize-stderr: "you are using [0-9]+\.[0-9]+\.[0-9]+(-[a-zA-Z0-9]+)?" -> "you are using $$RUSTC_VERSION"`
	`2`	`+`
`1`	`3`	`#![crate_type = "lib"]`
`2`	`4`	`#![feature(no_coverage)] //~ ERROR feature has been removed [E0557]`
`3`	`5`
Original file line number	Diff line number	Diff line change
`@@ -1,13 +1,14 @@`
`1`	`1`	`error[E0557]: feature has been removed`
`2`		`- --> $DIR/feature-gate-coverage-attribute.rs:2:12`
	`2`	`+ --> $DIR/feature-gate-coverage-attribute.rs:4:12`
`3`	`3`	`\|`
`4`	`4`	`LL \| #![feature(no_coverage)]`
`5`	`5`	`\| ^^^^^^^^^^^ feature has been removed`
`6`	`6`	`\|`
	`7`	`+ = note: removed in 1.74.0 (you are using $RUSTC_VERSION)`
`7`	`8`	= note: renamed to `coverage_attribute`
`8`	`9`
`9`	`10`	error[E0658]: the `#[coverage]` attribute is an experimental feature
`10`		`- --> $DIR/feature-gate-coverage-attribute.rs:10:1`
	`11`	`+ --> $DIR/feature-gate-coverage-attribute.rs:12:1`
`11`	`12`	`\|`
`12`	`13`	`LL \| #[coverage(off)]`
`13`	`14`	`\| ^^^^^^^^^^^^^^^^`
Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,4 @@`
	`1`	`+//@ normalize-stderr: "you are using [0-9]+\.[0-9]+\.[0-9]+(-[a-zA-Z0-9]+)?" -> "you are using $$RUSTC_VERSION"`
`1`	`2`	`#![feature(foo_bar_baz, foo(bar), foo = "baz", foo)]`
`2`	`3`	//~^ ERROR malformed `feature`
`3`	`4`	//~\| ERROR malformed `feature`