diff --git a/compiler/rustc_const_eval/src/const_eval/error.rs b/compiler/rustc_const_eval/src/const_eval/error.rs
index 4b1664b8156..b6adee435ba 100644
--- a/compiler/rustc_const_eval/src/const_eval/error.rs
+++ b/compiler/rustc_const_eval/src/const_eval/error.rs
@@ -168,7 +168,7 @@ pub(super) fn lint<'tcx, 'mir, L>(
     lint: &'static rustc_session::lint::Lint,
     decorator: impl FnOnce(Vec<errors::FrameNote>) -> L,
 ) where
-    L: for<'a> rustc_errors::DecorateLint<'a, ()>,
+    L: for<'a> rustc_errors::LintDiagnostic<'a, ()>,
 {
     let (span, frames) = get_span_and_frames(tcx, machine);
 
diff --git a/compiler/rustc_errors/src/diagnostic.rs b/compiler/rustc_errors/src/diagnostic.rs
index ccaf8c7a235..0c3e7fb75b0 100644
--- a/compiler/rustc_errors/src/diagnostic.rs
+++ b/compiler/rustc_errors/src/diagnostic.rs
@@ -193,8 +193,8 @@ pub trait SubdiagMessageOp<G> = Fn(&mut Diag<'_, G>, SubdiagMessage) -> SubdiagM
 
 /// Trait implemented by lint types. This should not be implemented manually. Instead, use
 /// `#[derive(LintDiagnostic)]` -- see [rustc_macros::LintDiagnostic].
-#[rustc_diagnostic_item = "DecorateLint"]
-pub trait DecorateLint<'a, G: EmissionGuarantee> {
+#[rustc_diagnostic_item = "LintDiagnostic"]
+pub trait LintDiagnostic<'a, G: EmissionGuarantee> {
     /// Decorate and emit a lint.
     fn decorate_lint<'b>(self, diag: &'b mut Diag<'a, G>);
 
diff --git a/compiler/rustc_errors/src/lib.rs b/compiler/rustc_errors/src/lib.rs
index 99c5bb46d2f..bedb677c1e9 100644
--- a/compiler/rustc_errors/src/lib.rs
+++ b/compiler/rustc_errors/src/lib.rs
@@ -37,8 +37,8 @@ extern crate self as rustc_errors;
 
 pub use codes::*;
 pub use diagnostic::{
-    BugAbort, DecorateLint, Diag, DiagArg, DiagArgMap, DiagArgName, DiagArgValue, DiagInner,
-    DiagStyledString, Diagnostic, EmissionGuarantee, FatalAbort, IntoDiagArg, StringPart, Subdiag,
+    BugAbort, Diag, DiagArg, DiagArgMap, DiagArgName, DiagArgValue, DiagInner, DiagStyledString,
+    Diagnostic, EmissionGuarantee, FatalAbort, IntoDiagArg, LintDiagnostic, StringPart, Subdiag,
     SubdiagMessageOp, Subdiagnostic,
 };
 pub use diagnostic_impls::{
diff --git a/compiler/rustc_lint/messages.ftl b/compiler/rustc_lint/messages.ftl
index df1e2b40265..d938a0ccb39 100644
--- a/compiler/rustc_lint/messages.ftl
+++ b/compiler/rustc_lint/messages.ftl
@@ -186,7 +186,7 @@ lint_deprecated_lint_name =
     .help = change it to {$replace}
 
 lint_diag_out_of_impl =
-    diagnostics should only be created in `Diagnostic`/`Subdiagnostic` impls
+    diagnostics should only be created in `Diagnostic`/`Subdiagnostic`/`LintDiagnostic` impls
 
 lint_drop_glue =
     types that do not implement `Drop` can still have drop glue, consider instead using `{$needs_drop}` to detect whether a type is trivially dropped
diff --git a/compiler/rustc_lint/src/builtin.rs b/compiler/rustc_lint/src/builtin.rs
index 5f0af6aee6a..595dc08b081 100644
--- a/compiler/rustc_lint/src/builtin.rs
+++ b/compiler/rustc_lint/src/builtin.rs
@@ -44,7 +44,7 @@ use rustc_ast::tokenstream::{TokenStream, TokenTree};
 use rustc_ast::visit::{FnCtxt, FnKind};
 use rustc_ast::{self as ast, *};
 use rustc_ast_pretty::pprust::{self, expr_to_string};
-use rustc_errors::{Applicability, DecorateLint, MultiSpan};
+use rustc_errors::{Applicability, LintDiagnostic, MultiSpan};
 use rustc_feature::{deprecated_attributes, AttributeGate, BuiltinAttribute, GateIssue, Stability};
 use rustc_hir as hir;
 use rustc_hir::def::{DefKind, Res};
@@ -327,7 +327,7 @@ impl UnsafeCode {
         &self,
         cx: &EarlyContext<'_>,
         span: Span,
-        decorate: impl for<'a> DecorateLint<'a, ()>,
+        decorate: impl for<'a> LintDiagnostic<'a, ()>,
     ) {
         // This comes from a macro that has `#[allow_internal_unsafe]`.
         if span.allows_unsafe() {
diff --git a/compiler/rustc_lint/src/context.rs b/compiler/rustc_lint/src/context.rs
index 89cdde11726..8c0e5b17fd8 100644
--- a/compiler/rustc_lint/src/context.rs
+++ b/compiler/rustc_lint/src/context.rs
@@ -21,7 +21,7 @@ use crate::passes::{EarlyLintPassObject, LateLintPassObject};
 use rustc_data_structures::fx::FxIndexMap;
 use rustc_data_structures::sync;
 use rustc_data_structures::unord::UnordMap;
-use rustc_errors::{DecorateLint, Diag, DiagMessage, MultiSpan};
+use rustc_errors::{Diag, DiagMessage, LintDiagnostic, MultiSpan};
 use rustc_feature::Features;
 use rustc_hir as hir;
 use rustc_hir::def::Res;
@@ -563,13 +563,13 @@ pub trait LintContext {
         decorate: impl for<'a, 'b> FnOnce(&'b mut Diag<'a, ()>),
     );
 
-    /// Emit a lint at `span` from a lint struct (some type that implements `DecorateLint`,
+    /// Emit a lint at `span` from a lint struct (some type that implements `LintDiagnostic`,
     /// typically generated by `#[derive(LintDiagnostic)]`).
     fn emit_span_lint<S: Into<MultiSpan>>(
         &self,
         lint: &'static Lint,
         span: S,
-        decorator: impl for<'a> DecorateLint<'a, ()>,
+        decorator: impl for<'a> LintDiagnostic<'a, ()>,
     ) {
         self.opt_span_lint(lint, Some(span), decorator.msg(), |diag| {
             decorator.decorate_lint(diag);
@@ -590,9 +590,9 @@ pub trait LintContext {
         self.opt_span_lint(lint, Some(span), msg, decorate);
     }
 
-    /// Emit a lint from a lint struct (some type that implements `DecorateLint`, typically
+    /// Emit a lint from a lint struct (some type that implements `LintDiagnostic`, typically
     /// generated by `#[derive(LintDiagnostic)]`).
-    fn emit_lint(&self, lint: &'static Lint, decorator: impl for<'a> DecorateLint<'a, ()>) {
+    fn emit_lint(&self, lint: &'static Lint, decorator: impl for<'a> LintDiagnostic<'a, ()>) {
         self.opt_span_lint(lint, None as Option<Span>, decorator.msg(), |diag| {
             decorator.decorate_lint(diag);
         });
diff --git a/compiler/rustc_lint/src/internal.rs b/compiler/rustc_lint/src/internal.rs
index edbd0bb1923..57fa14acdc1 100644
--- a/compiler/rustc_lint/src/internal.rs
+++ b/compiler/rustc_lint/src/internal.rs
@@ -352,14 +352,14 @@ declare_tool_lint! {
 declare_tool_lint! {
     /// The `diagnostic_outside_of_impl` lint detects calls to functions annotated with
     /// `#[rustc_lint_diagnostics]` that are outside an `Diagnostic`, `Subdiagnostic`, or
-    /// `DecorateLint` impl, or a `#[derive(Diagnostic)]`, `#[derive(Subdiagnostic)]`,
-    /// `#[derive(DecorateLint)]` expansion.
+    /// `LintDiagnostic` impl, or a `#[derive(Diagnostic)]`, `#[derive(Subdiagnostic)]`,
+    /// `#[derive(LintDiagnostic)]` expansion.
     ///
     /// More details on diagnostics implementations can be found
     /// [here](https://rustc-dev-guide.rust-lang.org/diagnostics/diagnostic-structs.html).
     pub rustc::DIAGNOSTIC_OUTSIDE_OF_IMPL,
     Deny,
-    "prevent creation of diagnostics outside of `Diagnostic`/`Subdiagnostic` impls",
+    "prevent diagnostic creation outside of `Diagnostic`/`Subdiagnostic`/`LintDiagnostic` impls",
     report_in_external_macro: true
 }
 
@@ -455,7 +455,7 @@ impl LateLintPass<'_> for Diagnostics {
         }
 
         // Calls to `#[rustc_lint_diagnostics]`-marked functions should only occur:
-        // - inside an impl of `Diagnostic`, `Subdiagnostic`, or `DecorateLint`, or
+        // - inside an impl of `Diagnostic`, `Subdiagnostic`, or `LintDiagnostic`, or
         // - inside a parent function that is itself marked with `#[rustc_lint_diagnostics]`.
         //
         // Otherwise, emit a `DIAGNOSTIC_OUTSIDE_OF_IMPL` lint.
@@ -467,7 +467,7 @@ impl LateLintPass<'_> for Diagnostics {
                     && let Impl { of_trait: Some(of_trait), .. } = impl_
                     && let Some(def_id) = of_trait.trait_def_id()
                     && let Some(name) = cx.tcx.get_diagnostic_name(def_id)
-                    && matches!(name, sym::Diagnostic | sym::Subdiagnostic | sym::DecorateLint)
+                    && matches!(name, sym::Diagnostic | sym::Subdiagnostic | sym::LintDiagnostic)
                 {
                     is_inside_appropriate_impl = true;
                     break;
diff --git a/compiler/rustc_lint/src/levels.rs b/compiler/rustc_lint/src/levels.rs
index 2f08cd53b75..e89df1c9840 100644
--- a/compiler/rustc_lint/src/levels.rs
+++ b/compiler/rustc_lint/src/levels.rs
@@ -16,7 +16,7 @@ use crate::{
 use rustc_ast as ast;
 use rustc_ast_pretty::pprust;
 use rustc_data_structures::fx::FxIndexMap;
-use rustc_errors::{DecorateLint, Diag, DiagMessage, MultiSpan};
+use rustc_errors::{Diag, DiagMessage, LintDiagnostic, MultiSpan};
 use rustc_feature::{Features, GateIssue};
 use rustc_hir as hir;
 use rustc_hir::intravisit::{self, Visitor};
@@ -1119,7 +1119,7 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
         &self,
         lint: &'static Lint,
         span: MultiSpan,
-        decorate: impl for<'a> DecorateLint<'a, ()>,
+        decorate: impl for<'a> LintDiagnostic<'a, ()>,
     ) {
         let (level, src) = self.lint_level(lint);
         lint_level(self.sess, lint, level, src, Some(span), decorate.msg(), |lint| {
@@ -1128,7 +1128,7 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
     }
 
     #[track_caller]
-    pub fn emit_lint(&self, lint: &'static Lint, decorate: impl for<'a> DecorateLint<'a, ()>) {
+    pub fn emit_lint(&self, lint: &'static Lint, decorate: impl for<'a> LintDiagnostic<'a, ()>) {
         let (level, src) = self.lint_level(lint);
         lint_level(self.sess, lint, level, src, None, decorate.msg(), |lint| {
             decorate.decorate_lint(lint);
diff --git a/compiler/rustc_lint/src/lints.rs b/compiler/rustc_lint/src/lints.rs
index 1d0b7e45a90..1dac2d89c6b 100644
--- a/compiler/rustc_lint/src/lints.rs
+++ b/compiler/rustc_lint/src/lints.rs
@@ -5,8 +5,8 @@ use std::num::NonZero;
 use crate::errors::RequestedLevel;
 use crate::fluent_generated as fluent;
 use rustc_errors::{
-    codes::*, Applicability, DecorateLint, Diag, DiagMessage, DiagStyledString, EmissionGuarantee,
-    SubdiagMessageOp, Subdiagnostic, SuggestionStyle,
+    codes::*, Applicability, Diag, DiagMessage, DiagStyledString, EmissionGuarantee,
+    LintDiagnostic, SubdiagMessageOp, Subdiagnostic, SuggestionStyle,
 };
 use rustc_hir::def_id::DefId;
 use rustc_macros::{LintDiagnostic, Subdiagnostic};
@@ -136,7 +136,7 @@ pub struct BuiltinMissingDebugImpl<'a> {
 }
 
 // Needed for def_path_str
-impl<'a> DecorateLint<'a, ()> for BuiltinMissingDebugImpl<'_> {
+impl<'a> LintDiagnostic<'a, ()> for BuiltinMissingDebugImpl<'_> {
     fn decorate_lint<'b>(self, diag: &'b mut rustc_errors::Diag<'a, ()>) {
         diag.arg("debug", self.tcx.def_path_str(self.def_id));
     }
@@ -241,7 +241,7 @@ pub struct BuiltinUngatedAsyncFnTrackCaller<'a> {
     pub session: &'a Session,
 }
 
-impl<'a> DecorateLint<'a, ()> for BuiltinUngatedAsyncFnTrackCaller<'_> {
+impl<'a> LintDiagnostic<'a, ()> for BuiltinUngatedAsyncFnTrackCaller<'_> {
     fn decorate_lint<'b>(self, diag: &'b mut Diag<'a, ()>) {
         diag.span_label(self.label, fluent::lint_label);
         rustc_session::parse::add_feature_diagnostics(
@@ -423,7 +423,7 @@ pub struct BuiltinUnpermittedTypeInit<'a> {
     pub tcx: TyCtxt<'a>,
 }
 
-impl<'a> DecorateLint<'a, ()> for BuiltinUnpermittedTypeInit<'_> {
+impl<'a> LintDiagnostic<'a, ()> for BuiltinUnpermittedTypeInit<'_> {
     fn decorate_lint<'b>(self, diag: &'b mut Diag<'a, ()>) {
         diag.arg("ty", self.ty);
         diag.span_label(self.label, fluent::lint_builtin_unpermitted_type_init_label);
@@ -1159,7 +1159,7 @@ pub struct NonFmtPanicUnused {
 }
 
 // Used because of two suggestions based on one Option<Span>
-impl<'a> DecorateLint<'a, ()> for NonFmtPanicUnused {
+impl<'a> LintDiagnostic<'a, ()> for NonFmtPanicUnused {
     fn decorate_lint<'b>(self, diag: &'b mut Diag<'a, ()>) {
         diag.arg("count", self.count);
         diag.note(fluent::lint_note);
@@ -1397,7 +1397,7 @@ pub struct DropTraitConstraintsDiag<'a> {
 }
 
 // Needed for def_path_str
-impl<'a> DecorateLint<'a, ()> for DropTraitConstraintsDiag<'_> {
+impl<'a> LintDiagnostic<'a, ()> for DropTraitConstraintsDiag<'_> {
     fn decorate_lint<'b>(self, diag: &'b mut Diag<'a, ()>) {
         diag.arg("predicate", self.predicate);
         diag.arg("needs_drop", self.tcx.def_path_str(self.def_id));
@@ -1414,7 +1414,7 @@ pub struct DropGlue<'a> {
 }
 
 // Needed for def_path_str
-impl<'a> DecorateLint<'a, ()> for DropGlue<'_> {
+impl<'a> LintDiagnostic<'a, ()> for DropGlue<'_> {
     fn decorate_lint<'b>(self, diag: &'b mut Diag<'a, ()>) {
         diag.arg("needs_drop", self.tcx.def_path_str(self.def_id));
     }
@@ -1689,7 +1689,7 @@ pub struct ImproperCTypes<'a> {
 }
 
 // Used because of the complexity of Option<DiagMessage>, DiagMessage, and Option<Span>
-impl<'a> DecorateLint<'a, ()> for ImproperCTypes<'_> {
+impl<'a> LintDiagnostic<'a, ()> for ImproperCTypes<'_> {
     fn decorate_lint<'b>(self, diag: &'b mut Diag<'a, ()>) {
         diag.arg("ty", self.ty);
         diag.arg("desc", self.desc);
@@ -1832,7 +1832,7 @@ pub enum UnusedDefSuggestion {
 }
 
 // Needed because of def_path_str
-impl<'a> DecorateLint<'a, ()> for UnusedDef<'_, '_> {
+impl<'a> LintDiagnostic<'a, ()> for UnusedDef<'_, '_> {
     fn decorate_lint<'b>(self, diag: &'b mut Diag<'a, ()>) {
         diag.arg("pre", self.pre);
         diag.arg("post", self.post);
@@ -1915,7 +1915,7 @@ pub struct AsyncFnInTraitDiag {
     pub sugg: Option<Vec<(Span, String)>>,
 }
 
-impl<'a> DecorateLint<'a, ()> for AsyncFnInTraitDiag {
+impl<'a> LintDiagnostic<'a, ()> for AsyncFnInTraitDiag {
     fn decorate_lint<'b>(self, diag: &'b mut Diag<'a, ()>) {
         diag.note(fluent::lint_note);
         if let Some(sugg) = self.sugg {
diff --git a/compiler/rustc_macros/src/diagnostics/diagnostic.rs b/compiler/rustc_macros/src/diagnostics/diagnostic.rs
index c28e096455f..9d21d88165e 100644
--- a/compiler/rustc_macros/src/diagnostics/diagnostic.rs
+++ b/compiler/rustc_macros/src/diagnostics/diagnostic.rs
@@ -153,7 +153,7 @@ impl<'a> LintDiagnosticDerive<'a> {
         });
 
         let mut imp = structure.gen_impl(quote! {
-            gen impl<'__a> rustc_errors::DecorateLint<'__a, ()> for @Self {
+            gen impl<'__a> rustc_errors::LintDiagnostic<'__a, ()> for @Self {
                 #[track_caller]
                 fn decorate_lint<'__b>(
                     self,
diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs
index 0855f6c53fc..b08e5df30ef 100644
--- a/compiler/rustc_middle/src/ty/context.rs
+++ b/compiler/rustc_middle/src/ty/context.rs
@@ -43,7 +43,7 @@ use rustc_data_structures::sync::{self, FreezeReadGuard, Lock, Lrc, WorkerLocal}
 #[cfg(parallel_compiler)]
 use rustc_data_structures::sync::{DynSend, DynSync};
 use rustc_data_structures::unord::UnordSet;
-use rustc_errors::{DecorateLint, Diag, DiagCtxt, DiagMessage, ErrorGuaranteed, MultiSpan};
+use rustc_errors::{Diag, DiagCtxt, DiagMessage, ErrorGuaranteed, LintDiagnostic, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, LOCAL_CRATE};
@@ -2129,7 +2129,7 @@ impl<'tcx> TyCtxt<'tcx> {
         T::collect_and_apply(iter, |xs| self.mk_bound_variable_kinds(xs))
     }
 
-    /// Emit a lint at `span` from a lint struct (some type that implements `DecorateLint`,
+    /// Emit a lint at `span` from a lint struct (some type that implements `LintDiagnostic`,
     /// typically generated by `#[derive(LintDiagnostic)]`).
     #[track_caller]
     pub fn emit_node_span_lint(
@@ -2137,7 +2137,7 @@ impl<'tcx> TyCtxt<'tcx> {
         lint: &'static Lint,
         hir_id: HirId,
         span: impl Into<MultiSpan>,
-        decorator: impl for<'a> DecorateLint<'a, ()>,
+        decorator: impl for<'a> LintDiagnostic<'a, ()>,
     ) {
         let msg = decorator.msg();
         let (level, src) = self.lint_level_at_node(lint, hir_id);
@@ -2163,14 +2163,14 @@ impl<'tcx> TyCtxt<'tcx> {
         lint_level(self.sess, lint, level, src, Some(span.into()), msg, decorate);
     }
 
-    /// Emit a lint from a lint struct (some type that implements `DecorateLint`, typically
+    /// Emit a lint from a lint struct (some type that implements `LintDiagnostic`, typically
     /// generated by `#[derive(LintDiagnostic)]`).
     #[track_caller]
     pub fn emit_node_lint(
         self,
         lint: &'static Lint,
         id: HirId,
-        decorator: impl for<'a> DecorateLint<'a, ()>,
+        decorator: impl for<'a> LintDiagnostic<'a, ()>,
     ) {
         self.node_lint(lint, id, decorator.msg(), |diag| {
             decorator.decorate_lint(diag);
diff --git a/compiler/rustc_mir_transform/src/errors.rs b/compiler/rustc_mir_transform/src/errors.rs
index 7d08c134057..9297bc51fad 100644
--- a/compiler/rustc_mir_transform/src/errors.rs
+++ b/compiler/rustc_mir_transform/src/errors.rs
@@ -1,8 +1,8 @@
 use std::borrow::Cow;
 
 use rustc_errors::{
-    codes::*, Applicability, DecorateLint, Diag, DiagArgValue, DiagCtxt, DiagMessage, Diagnostic,
-    EmissionGuarantee, Level,
+    codes::*, Applicability, Diag, DiagArgValue, DiagCtxt, DiagMessage, Diagnostic,
+    EmissionGuarantee, Level, LintDiagnostic,
 };
 use rustc_macros::{Diagnostic, LintDiagnostic, Subdiagnostic};
 use rustc_middle::mir::{AssertKind, UnsafetyViolationDetails};
@@ -181,7 +181,7 @@ pub(crate) struct UnsafeOpInUnsafeFn {
     pub suggest_unsafe_block: Option<(Span, Span, Span)>,
 }
 
-impl<'a> DecorateLint<'a, ()> for UnsafeOpInUnsafeFn {
+impl<'a> LintDiagnostic<'a, ()> for UnsafeOpInUnsafeFn {
     #[track_caller]
     fn decorate_lint<'b>(self, diag: &'b mut Diag<'a, ()>) {
         let desc = diag.dcx.eagerly_translate_to_string(self.details.label(), [].into_iter());
@@ -215,7 +215,7 @@ pub(crate) enum AssertLintKind {
     UnconditionalPanic,
 }
 
-impl<'a, P: std::fmt::Debug> DecorateLint<'a, ()> for AssertLint<P> {
+impl<'a, P: std::fmt::Debug> LintDiagnostic<'a, ()> for AssertLint<P> {
     fn decorate_lint<'b>(self, diag: &'b mut Diag<'a, ()>) {
         let message = self.assert_kind.diagnostic_message();
         self.assert_kind.add_args(&mut |name, value| {
@@ -269,7 +269,7 @@ pub(crate) struct MustNotSupend<'tcx, 'a> {
 }
 
 // Needed for def_path_str
-impl<'a> DecorateLint<'a, ()> for MustNotSupend<'_, '_> {
+impl<'a> LintDiagnostic<'a, ()> for MustNotSupend<'_, '_> {
     fn decorate_lint<'b>(self, diag: &'b mut rustc_errors::Diag<'a, ()>) {
         diag.span_label(self.yield_sp, fluent::_subdiag::label);
         if let Some(reason) = self.reason {
diff --git a/compiler/rustc_pattern_analysis/src/lints.rs b/compiler/rustc_pattern_analysis/src/lints.rs
index 30e775733de..16530960656 100644
--- a/compiler/rustc_pattern_analysis/src/lints.rs
+++ b/compiler/rustc_pattern_analysis/src/lints.rs
@@ -97,7 +97,7 @@ pub(crate) fn lint_nonexhaustive_missing_variants<'p, 'tcx>(
                     lint_name: "non_exhaustive_omitted_patterns",
                 };
 
-                use rustc_errors::DecorateLint;
+                use rustc_errors::LintDiagnostic;
                 let mut err = rcx.tcx.dcx().struct_span_warn(arm.pat.data().unwrap().span, "");
                 err.primary_message(decorator.msg());
                 decorator.decorate_lint(&mut err);
diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs
index 0c8732d3cd0..a8426d78cac 100644
--- a/compiler/rustc_span/src/symbol.rs
+++ b/compiler/rustc_span/src/symbol.rs
@@ -183,7 +183,6 @@ symbols! {
         DebugStruct,
         Decodable,
         Decoder,
-        DecorateLint,
         Default,
         Deref,
         DiagMessage,
@@ -242,6 +241,7 @@ symbols! {
         Layout,
         Left,
         LinkedList,
+        LintDiagnostic,
         LintPass,
         LocalKey,
         Mutex,
diff --git a/tests/ui-fulldeps/internal-lints/diagnostics.rs b/tests/ui-fulldeps/internal-lints/diagnostics.rs
index f9399cb81c8..d443681d5db 100644
--- a/tests/ui-fulldeps/internal-lints/diagnostics.rs
+++ b/tests/ui-fulldeps/internal-lints/diagnostics.rs
@@ -14,7 +14,7 @@ extern crate rustc_session;
 extern crate rustc_span;
 
 use rustc_errors::{
-    DecorateLint, Diag, DiagCtxt, DiagInner, DiagMessage, Diagnostic, EmissionGuarantee, Level,
+    Diag, DiagCtxt, DiagInner, DiagMessage, Diagnostic, EmissionGuarantee, Level, LintDiagnostic,
     SubdiagMessageOp, Subdiagnostic,
 };
 use rustc_macros::{Diagnostic, Subdiagnostic};
@@ -78,9 +78,9 @@ impl Subdiagnostic for TranslatableInAddtoDiag {
     }
 }
 
-pub struct UntranslatableInDecorateLint;
+pub struct UntranslatableInLintDiagnostic;
 
-impl<'a> DecorateLint<'a, ()> for UntranslatableInDecorateLint {
+impl<'a> LintDiagnostic<'a, ()> for UntranslatableInLintDiagnostic {
     fn decorate_lint<'b, >(self, diag: &'b mut Diag<'a, ()>) {
         diag.note("untranslatable diagnostic");
         //~^ ERROR diagnostics should be created using translatable messages
@@ -91,9 +91,9 @@ impl<'a> DecorateLint<'a, ()> for UntranslatableInDecorateLint {
     }
 }
 
-pub struct TranslatableInDecorateLint;
+pub struct TranslatableInLintDiagnostic;
 
-impl<'a> DecorateLint<'a, ()> for TranslatableInDecorateLint {
+impl<'a> LintDiagnostic<'a, ()> for TranslatableInLintDiagnostic {
     fn decorate_lint<'b>(self, diag: &'b mut Diag<'a, ()>) {
         diag.note(crate::fluent_generated::no_crate_note);
     }
@@ -105,10 +105,10 @@ impl<'a> DecorateLint<'a, ()> for TranslatableInDecorateLint {
 
 pub fn make_diagnostics<'a>(dcx: &'a DiagCtxt) {
     let _diag = dcx.struct_err(crate::fluent_generated::no_crate_example);
-    //~^ ERROR diagnostics should only be created in `Diagnostic`/`Subdiagnostic` impls
+    //~^ ERROR diagnostics should only be created in `Diagnostic`/`Subdiagnostic`/`LintDiagnostic` impls
 
     let _diag = dcx.struct_err("untranslatable diagnostic");
-    //~^ ERROR diagnostics should only be created in `Diagnostic`/`Subdiagnostic` impls
+    //~^ ERROR diagnostics should only be created in `Diagnostic`/`Subdiagnostic`/`LintDiagnostic` impls
     //~^^ ERROR diagnostics should be created using translatable messages
 }
 
diff --git a/tests/ui-fulldeps/internal-lints/diagnostics.stderr b/tests/ui-fulldeps/internal-lints/diagnostics.stderr
index 01184d7264b..ee5400f6f95 100644
--- a/tests/ui-fulldeps/internal-lints/diagnostics.stderr
+++ b/tests/ui-fulldeps/internal-lints/diagnostics.stderr
@@ -22,7 +22,7 @@ error: diagnostics should be created using translatable messages
 LL |         diag.note("untranslatable diagnostic");
    |              ^^^^
 
-error: diagnostics should only be created in `Diagnostic`/`Subdiagnostic` impls
+error: diagnostics should only be created in `Diagnostic`/`Subdiagnostic`/`LintDiagnostic` impls
   --> $DIR/diagnostics.rs:107:21
    |
 LL |     let _diag = dcx.struct_err(crate::fluent_generated::no_crate_example);
@@ -34,7 +34,7 @@ note: the lint level is defined here
 LL | #![deny(rustc::diagnostic_outside_of_impl)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: diagnostics should only be created in `Diagnostic`/`Subdiagnostic` impls
+error: diagnostics should only be created in `Diagnostic`/`Subdiagnostic`/`LintDiagnostic` impls
   --> $DIR/diagnostics.rs:110:21
    |
 LL |     let _diag = dcx.struct_err("untranslatable diagnostic");