Add `SubdiagnosticMessageOp` as a trait alias.

It avoids a lot of repetition.

1 files changed, 5 insertions, 9 deletions

diff --git a/compiler/rustc_ast_lowering/src/errors.rs b/compiler/rustc_ast_lowering/src/errors.rs
index ec92afee47a..62253585695 100644
--- a/compiler/rustc_ast_lowering/src/errors.rs
+++ b/compiler/rustc_ast_lowering/src/errors.rs
@@ -1,4 +1,6 @@
-use rustc_errors::{codes::*, DiagnosticArgFromDisplay};
+use rustc_errors::{
+    codes::*, AddToDiagnostic, Diagnostic, DiagnosticArgFromDisplay, SubdiagnosticMessageOp,
+};
 use rustc_macros::{Diagnostic, Subdiagnostic};
 use rustc_span::{symbol::Ident, Span, Symbol};
 
@@ -38,14 +40,8 @@ pub struct InvalidAbi {
 
 pub struct InvalidAbiReason(pub &'static str);
 
-impl rustc_errors::AddToDiagnostic for InvalidAbiReason {
-    fn add_to_diagnostic_with<F>(self, diag: &mut rustc_errors::Diagnostic, _: F)
-    where
-        F: Fn(
-            &mut rustc_errors::Diagnostic,
-            rustc_errors::SubdiagnosticMessage,
-        ) -> rustc_errors::SubdiagnosticMessage,
-    {
+impl AddToDiagnostic for InvalidAbiReason {
+    fn add_to_diagnostic_with<F: SubdiagnosticMessageOp>(self, diag: &mut Diagnostic, _: F) {
         #[allow(rustc::untranslatable_diagnostic)]
         diag.note(self.0);
     }