Remove attr_id from stable lint ids.

compiler/rustc_errors/src/diagnostic.rs

@@ -368,7 +368,7 @@ impl DiagInner {
                 panic!("{expectation_id:?} must have a matching stable id")
             };
 
-            let mut stable_id = stable_id.normalize();
+            let mut stable_id = *stable_id;
             stable_id.set_lint_index(lint_index);
             *expectation_id = stable_id;
         }

compiler/rustc_errors/src/lib.rs

@@ -1567,7 +1567,7 @@ impl DiagCtxtInner {
                 if let LintExpectationId::Unstable { .. } = expect_id {
                     unreachable!(); // this case was handled at the top of this function
                 }
-                self.fulfilled_expectations.insert(expect_id.normalize());
+                self.fulfilled_expectations.insert(expect_id);
                 if let Expect(_) = diagnostic.level {
                     // Nothing emitted here for expected lints.
                     TRACK_DIAGNOSTIC(diagnostic, &mut |_| None);

compiler/rustc_lint/src/expect.rs

@@ -20,8 +20,7 @@ fn lint_expectations(tcx: TyCtxt<'_>, (): ()) -> Vec<(LintExpectationId, LintExp
     let mut unstable_to_stable_ids = FxIndexMap::default();
 
     let mut record_stable = |attr_id, hir_id, attr_index| {
-        let expect_id =
+        let expect_id = LintExpectationId::Stable { hir_id, attr_index, lint_index: None };
-            LintExpectationId::Stable { hir_id, attr_index, lint_index: None, attr_id: None };
         unstable_to_stable_ids.entry(attr_id).or_insert(expect_id);
     };
     let mut push_expectations = |owner| {

compiler/rustc_lint/src/levels.rs

@@ -218,7 +218,7 @@ impl LintLevelsProvider for LintLevelQueryMap<'_> {
         self.specs.lint_level_id_at_node(self.tcx, LintId::of(lint), self.cur)
     }
     fn push_expectation(&mut self, id: LintExpectationId, expectation: LintExpectation) {
-        self.specs.expectations.push((id.normalize(), expectation))
+        self.specs.expectations.push((id, expectation))
     }
 }
 
@@ -486,13 +486,9 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
     /// Attempts to insert the `id` to `level_src` map entry. If unsuccessful
     /// (e.g. if a forbid was already inserted on the same scope), then emits a
     /// diagnostic with no change to `specs`.
-    fn insert_spec(&mut self, id: LintId, (mut level, src): LevelAndSource) {
+    fn insert_spec(&mut self, id: LintId, (level, src): LevelAndSource) {
         let (old_level, old_src) = self.provider.get_lint_level(id.lint, self.sess);
-        if let Level::Expect(id) = &mut level
+
-            && let LintExpectationId::Stable { .. } = id
-        {
-            *id = id.normalize();
-        }
         // Setting to a non-forbid level is an error if the lint previously had
         // a forbid level. Note that this is not necessarily true even with a
         // `#[forbid(..)]` attribute present, as that is overridden by `--cap-lints`.
@@ -604,17 +600,15 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
                 // This is the only lint level with a `LintExpectationId` that can be created from
                 // an attribute.
                 Some(Level::Expect(unstable_id)) if let Some(hir_id) = source_hir_id => {
-                    let LintExpectationId::Unstable { attr_id, lint_index } = unstable_id else {
+                    let LintExpectationId::Unstable { lint_index: None, attr_id: _ } = unstable_id
+                    else {
                         bug!("stable id Level::from_attr")
                     };
 
                     let stable_id = LintExpectationId::Stable {
                         hir_id,
                         attr_index: attr_index.try_into().unwrap(),
-                        lint_index,
+                        lint_index: None,
-                        // We pass the previous unstable attr_id such that we can trace the ast id
-                        // when building a map to go from unstable to stable id.
-                        attr_id: Some(attr_id),
                     };
 
                     Level::Expect(stable_id)

compiler/rustc_lint_defs/src/lib.rs

@@ -98,7 +98,7 @@ pub enum LintExpectationId {
     /// stable and can be cached. The additional index ensures that nodes with
     /// several expectations can correctly match diagnostics to the individual
     /// expectation.
-    Stable { hir_id: HirId, attr_index: u16, lint_index: Option<u16>, attr_id: Option<AttrId> },
+    Stable { hir_id: HirId, attr_index: u16, lint_index: Option<u16> },
 }
 
 impl LintExpectationId {
@@ -122,31 +122,13 @@ impl LintExpectationId {
 
         *lint_index = new_lint_index
     }
-
-    /// Prepares the id for hashing. Removes references to the ast.
-    /// Should only be called when the id is stable.
-    pub fn normalize(self) -> Self {
-        match self {
-            Self::Stable { hir_id, attr_index, lint_index, .. } => {
-                Self::Stable { hir_id, attr_index, lint_index, attr_id: None }
-            }
-            Self::Unstable { .. } => {
-                unreachable!("`normalize` called when `ExpectationId` is unstable")
-            }
-        }
-    }
 }
 
 impl<HCX: rustc_hir::HashStableContext> HashStable<HCX> for LintExpectationId {
     #[inline]
     fn hash_stable(&self, hcx: &mut HCX, hasher: &mut StableHasher) {
         match self {
-            LintExpectationId::Stable {
+            LintExpectationId::Stable { hir_id, attr_index, lint_index: Some(lint_index) } => {
-                hir_id,
-                attr_index,
-                lint_index: Some(lint_index),
-                attr_id: _,
-            } => {
                 hir_id.hash_stable(hcx, hasher);
                 attr_index.hash_stable(hcx, hasher);
                 lint_index.hash_stable(hcx, hasher);
@@ -166,12 +148,9 @@ impl<HCX: rustc_hir::HashStableContext> ToStableHashKey<HCX> for LintExpectation
     #[inline]
     fn to_stable_hash_key(&self, _: &HCX) -> Self::KeyType {
         match self {
-            LintExpectationId::Stable {
+            LintExpectationId::Stable { hir_id, attr_index, lint_index: Some(lint_index) } => {
-                hir_id,
+                (*hir_id, *attr_index, *lint_index)
-                attr_index,
+            }
-                lint_index: Some(lint_index),
-                attr_id: _,
-            } => (*hir_id, *attr_index, *lint_index),
             _ => {
                 unreachable!("HashStable should only be called for a filled `LintExpectationId`")
             }