diff --git a/clippy_lints/src/inline_fn_without_body.rs b/clippy_lints/src/inline_fn_without_body.rs
index bc236c5c71f..83ecaeef982 100644
--- a/clippy_lints/src/inline_fn_without_body.rs
+++ b/clippy_lints/src/inline_fn_without_body.rs
@@ -1,7 +1,7 @@
 //! checks for `#[inline]` on trait methods without bodies
 
 use clippy_utils::diagnostics::span_lint_and_then;
-use clippy_utils::sugg::DiagnosticExt;
+use clippy_utils::sugg::DiagExt;
 use rustc_ast::ast::Attribute;
 use rustc_errors::Applicability;
 use rustc_hir::{TraitFn, TraitItem, TraitItemKind};
diff --git a/clippy_lints/src/new_without_default.rs b/clippy_lints/src/new_without_default.rs
index b3b8a5e9963..627b4968d9f 100644
--- a/clippy_lints/src/new_without_default.rs
+++ b/clippy_lints/src/new_without_default.rs
@@ -1,7 +1,7 @@
 use clippy_utils::diagnostics::span_lint_hir_and_then;
 use clippy_utils::return_ty;
 use clippy_utils::source::snippet;
-use clippy_utils::sugg::DiagnosticExt;
+use clippy_utils::sugg::DiagExt;
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_hir::HirIdSet;
diff --git a/clippy_utils/src/sugg.rs b/clippy_utils/src/sugg.rs
index d2ec327534a..e74621a0fbb 100644
--- a/clippy_utils/src/sugg.rs
+++ b/clippy_utils/src/sugg.rs
@@ -685,7 +685,7 @@ fn indentation<T: LintContext>(cx: &T, span: Span) -> Option<String> {
 }
 
 /// Convenience extension trait for `Diag`.
-pub trait DiagnosticExt<T: LintContext> {
+pub trait DiagExt<T: LintContext> {
     /// Suggests to add an attribute to an item.
     ///
     /// Correctly handles indentation of the attribute and item.
@@ -732,7 +732,7 @@ fn suggest_item_with_attr<D: Display + ?Sized>(
     fn suggest_remove_item(&mut self, cx: &T, item: Span, msg: &str, applicability: Applicability);
 }
 
-impl<T: LintContext> DiagnosticExt<T> for rustc_errors::Diag<'_, ()> {
+impl<T: LintContext> DiagExt<T> for rustc_errors::Diag<'_, ()> {
     fn suggest_item_with_attr<D: Display + ?Sized>(
         &mut self,
         cx: &T,
diff --git a/tests/ui-internal/disallow_span_lint.rs b/tests/ui-internal/disallow_span_lint.rs
index b9b4a07d29d..c5029bbd9a4 100644
--- a/tests/ui-internal/disallow_span_lint.rs
+++ b/tests/ui-internal/disallow_span_lint.rs
@@ -5,12 +5,17 @@
 extern crate rustc_lint;
 extern crate rustc_middle;
 
-use rustc_errors::{DiagnosticMessage, MultiSpan};
+use rustc_errors::{DiagMessage, MultiSpan};
 use rustc_hir::hir_id::HirId;
 use rustc_lint::{Lint, LintContext};
 use rustc_middle::ty::TyCtxt;
 
-pub fn a(cx: impl LintContext, lint: &'static Lint, span: impl Into<MultiSpan>, msg: impl Into<DiagnosticMessage>) {
+pub fn a(
+    cx: impl LintContext,
+    lint: &'static Lint,
+    span: impl Into<MultiSpan>,
+    msg: impl Into<DiagMessage>)
+{
     cx.span_lint(lint, span, msg, |_| {});
 }
 
@@ -19,7 +24,7 @@ pub fn b(
     lint: &'static Lint,
     hir_id: HirId,
     span: impl Into<MultiSpan>,
-    msg: impl Into<DiagnosticMessage>,
+    msg: impl Into<DiagMessage>,
 ) {
     tcx.node_span_lint(lint, hir_id, span, msg, |_| {});
 }