Add `SubdiagnosticMessageOp` as a trait alias.

It avoids a lot of repetition.

1 files changed, 3 insertions, 9 deletions

diff --git a/compiler/rustc_mir_build/src/errors.rs b/compiler/rustc_mir_build/src/errors.rs
index 232b6033946..0bc5fe6ef89 100644
--- a/compiler/rustc_mir_build/src/errors.rs
+++ b/compiler/rustc_mir_build/src/errors.rs
@@ -2,7 +2,7 @@ use crate::fluent_generated as fluent;
 use rustc_errors::DiagnosticArgValue;
 use rustc_errors::{
     codes::*, AddToDiagnostic, Applicability, DiagCtxt, Diagnostic, DiagnosticBuilder,
-    IntoDiagnostic, Level, MultiSpan, SubdiagnosticMessage,
+    IntoDiagnostic, Level, MultiSpan, SubdiagnosticMessageOp,
 };
 use rustc_macros::{Diagnostic, LintDiagnostic, Subdiagnostic};
 use rustc_middle::ty::{self, Ty};
@@ -420,10 +420,7 @@ pub struct UnsafeNotInheritedLintNote {
 }
 
 impl AddToDiagnostic for UnsafeNotInheritedLintNote {
-    fn add_to_diagnostic_with<F>(self, diag: &mut Diagnostic, _: F)
-    where
-        F: Fn(&mut Diagnostic, SubdiagnosticMessage) -> SubdiagnosticMessage,
-    {
+    fn add_to_diagnostic_with<F: SubdiagnosticMessageOp>(self, diag: &mut Diagnostic, _: F) {
         diag.span_note(self.signature_span, fluent::mir_build_unsafe_fn_safe_body);
         let body_start = self.body_span.shrink_to_lo();
         let body_end = self.body_span.shrink_to_hi();
@@ -866,10 +863,7 @@ pub struct Variant {
 }
 
 impl<'tcx> AddToDiagnostic for AdtDefinedHere<'tcx> {
-    fn add_to_diagnostic_with<F>(self, diag: &mut Diagnostic, _: F)
-    where
-        F: Fn(&mut Diagnostic, SubdiagnosticMessage) -> SubdiagnosticMessage,
-    {
+    fn add_to_diagnostic_with<F: SubdiagnosticMessageOp>(self, diag: &mut Diagnostic, _: F) {
         diag.arg("ty", self.ty);
         let mut spans = MultiSpan::from(self.adt_def_span);