2 files changed, 13 insertions, 18 deletions
diff --git a/compiler/rustc_errors/src/diagnostic.rs b/compiler/rustc_errors/src/diagnostic.rs
index 3303e4ee752..34aebadfdad 100644
--- a/compiler/rustc_errors/src/diagnostic.rs
+++ b/compiler/rustc_errors/src/diagnostic.rs
@@ -12,7 +12,7 @@ use rustc_lint_defs::{Applicability, LintExpectationId};
 use rustc_macros::{Decodable, Encodable};
 use rustc_span::source_map::Spanned;
 use rustc_span::symbol::Symbol;
-use rustc_span::{Span, DUMMY_SP};
+use rustc_span::{AttrId, Span, DUMMY_SP};
 use tracing::debug;
 
 use crate::snippet::Style;
@@ -356,24 +356,19 @@ impl DiagInner {
 
     pub(crate) fn update_unstable_expectation_id(
         &mut self,
-        unstable_to_stable: &FxIndexMap<LintExpectationId, LintExpectationId>,
+        unstable_to_stable: &FxIndexMap<AttrId, LintExpectationId>,
     ) {
         if let Level::Expect(expectation_id) | Level::ForceWarning(Some(expectation_id)) =
             &mut self.level
+            && let LintExpectationId::Unstable { attr_id, lint_index } = *expectation_id
         {
-            if expectation_id.is_stable() {
-                return;
-            }
-
             // The unstable to stable map only maps the unstable `AttrId` to a stable `HirId` with an attribute index.
             // The lint index inside the attribute is manually transferred here.
-            let lint_index = expectation_id.get_lint_index();
-            expectation_id.set_lint_index(None);
-            let mut stable_id = unstable_to_stable
-                .get(expectation_id)
-                .expect("each unstable `LintExpectationId` must have a matching stable id")
-                .normalize();
+            let Some(stable_id) = unstable_to_stable.get(&attr_id) else {
+                panic!("{expectation_id:?} must have a matching stable id")
+            };
 
+            let mut stable_id = *stable_id;
             stable_id.set_lint_index(lint_index);
             *expectation_id = stable_id;
         }
diff --git a/compiler/rustc_errors/src/lib.rs b/compiler/rustc_errors/src/lib.rs
index 99ee8fb17d7..e08d28a156c 100644
--- a/compiler/rustc_errors/src/lib.rs
+++ b/compiler/rustc_errors/src/lib.rs
@@ -69,7 +69,7 @@ use rustc_macros::{Decodable, Encodable};
 pub use rustc_span::fatal_error::{FatalError, FatalErrorMarker};
 use rustc_span::source_map::SourceMap;
 pub use rustc_span::ErrorGuaranteed;
-use rustc_span::{Loc, Span, DUMMY_SP};
+use rustc_span::{AttrId, Loc, Span, DUMMY_SP};
 pub use snippet::Style;
 // Used by external projects such as `rust-gpu`.
 // See https://github.com/rust-lang/rust/pull/115393.
@@ -1096,7 +1096,7 @@ impl<'a> DiagCtxtHandle<'a> {
 
     pub fn update_unstable_expectation_id(
         &self,
-        unstable_to_stable: &FxIndexMap<LintExpectationId, LintExpectationId>,
+        unstable_to_stable: FxIndexMap<AttrId, LintExpectationId>,
     ) {
         let mut inner = self.inner.borrow_mut();
         let diags = std::mem::take(&mut inner.unstable_expect_diagnostics);
@@ -1105,7 +1105,7 @@ impl<'a> DiagCtxtHandle<'a> {
         if !diags.is_empty() {
             inner.suppressed_expected_diag = true;
             for mut diag in diags.into_iter() {
-                diag.update_unstable_expectation_id(unstable_to_stable);
+                diag.update_unstable_expectation_id(&unstable_to_stable);
 
                 // Here the diagnostic is given back to `emit_diagnostic` where it was first
                 // intercepted. Now it should be processed as usual, since the unstable expectation
@@ -1117,11 +1117,11 @@ impl<'a> DiagCtxtHandle<'a> {
         inner
             .stashed_diagnostics
             .values_mut()
-            .for_each(|(diag, _guar)| diag.update_unstable_expectation_id(unstable_to_stable));
+            .for_each(|(diag, _guar)| diag.update_unstable_expectation_id(&unstable_to_stable));
         inner
             .future_breakage_diagnostics
             .iter_mut()
-            .for_each(|diag| diag.update_unstable_expectation_id(unstable_to_stable));
+            .for_each(|diag| diag.update_unstable_expectation_id(&unstable_to_stable));
     }
 
     /// This methods steals all [`LintExpectationId`]s that are stored inside
@@ -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);