Rollup merge of #118989 - compiler-errors:lint-decorator-2, r=WaffleLapkin

Simplify lint decorator derive too

See last commit, since this is stacked on top of #118727.

r? WaffleLapkin

1 files changed, 3 insertions, 17 deletions

diff --git a/compiler/rustc_mir_transform/src/errors.rs b/compiler/rustc_mir_transform/src/errors.rs
index dbf27ea60f8..928db471298 100644
--- a/compiler/rustc_mir_transform/src/errors.rs
+++ b/compiler/rustc_mir_transform/src/errors.rs
@@ -180,10 +180,7 @@ pub(crate) struct UnsafeOpInUnsafeFn {
 
 impl<'a> DecorateLint<'a, ()> for UnsafeOpInUnsafeFn {
     #[track_caller]
-    fn decorate_lint<'b>(
-        self,
-        diag: &'b mut DiagnosticBuilder<'a, ()>,
-    ) -> &'b mut DiagnosticBuilder<'a, ()> {
+    fn decorate_lint<'b>(self, diag: &'b mut DiagnosticBuilder<'a, ()>) {
         let handler = diag.handler().expect("lint should not yet be emitted");
         let desc = handler.eagerly_translate_to_string(self.details.label(), [].into_iter());
         diag.set_arg("details", desc);
@@ -198,8 +195,6 @@ impl<'a> DecorateLint<'a, ()> for UnsafeOpInUnsafeFn {
                 Applicability::MaybeIncorrect,
             );
         }
-
-        diag
     }
 
     fn msg(&self) -> DiagnosticMessage {
@@ -213,10 +208,7 @@ pub(crate) enum AssertLint<P> {
 }
 
 impl<'a, P: std::fmt::Debug> DecorateLint<'a, ()> for AssertLint<P> {
-    fn decorate_lint<'b>(
-        self,
-        diag: &'b mut DiagnosticBuilder<'a, ()>,
-    ) -> &'b mut DiagnosticBuilder<'a, ()> {
+    fn decorate_lint<'b>(self, diag: &'b mut DiagnosticBuilder<'a, ()>) {
         let span = self.span();
         let assert_kind = self.panic();
         let message = assert_kind.diagnostic_message();
@@ -224,8 +216,6 @@ impl<'a, P: std::fmt::Debug> DecorateLint<'a, ()> for AssertLint<P> {
             diag.set_arg(name, value);
         });
         diag.span_label(span, message);
-
-        diag
     }
 
     fn msg(&self) -> DiagnosticMessage {
@@ -284,10 +274,7 @@ pub(crate) struct MustNotSupend<'tcx, 'a> {
 
 // Needed for def_path_str
 impl<'a> DecorateLint<'a, ()> for MustNotSupend<'_, '_> {
-    fn decorate_lint<'b>(
-        self,
-        diag: &'b mut rustc_errors::DiagnosticBuilder<'a, ()>,
-    ) -> &'b mut rustc_errors::DiagnosticBuilder<'a, ()> {
+    fn decorate_lint<'b>(self, diag: &'b mut rustc_errors::DiagnosticBuilder<'a, ()>) {
         diag.span_label(self.yield_sp, fluent::_subdiag::label);
         if let Some(reason) = self.reason {
             diag.subdiagnostic(reason);
@@ -296,7 +283,6 @@ impl<'a> DecorateLint<'a, ()> for MustNotSupend<'_, '_> {
         diag.set_arg("pre", self.pre);
         diag.set_arg("def_path", self.tcx.def_path_str(self.def_id));
         diag.set_arg("post", self.post);
-        diag
     }
 
     fn msg(&self) -> rustc_errors::DiagnosticMessage {