Rollup merge of #118933 - nnethercote:cleanup-errors-even-more, r=compiler-errors

Cleanup errors handlers even more

A sequel to #118587.

r? `@compiler-errors`

2 files changed, 3 insertions, 5 deletions

diff --git a/src/tools/miri/src/diagnostics.rs b/src/tools/miri/src/diagnostics.rs
index ef394b16310..e0f59144975 100644
--- a/src/tools/miri/src/diagnostics.rs
+++ b/src/tools/miri/src/diagnostics.rs
@@ -512,7 +512,7 @@ pub fn report_msg<'tcx>(
         }
     }
 
-    handler.emit_diagnostic(&mut err);
+    handler.emit_diagnostic(err);
 }
 
 impl<'mir, 'tcx> MiriMachine<'mir, 'tcx> {
diff --git a/src/tools/rustfmt/src/parse/session.rs b/src/tools/rustfmt/src/parse/session.rs
index 0573df9de2f..06f9c4c6243 100644
--- a/src/tools/rustfmt/src/parse/session.rs
+++ b/src/tools/rustfmt/src/parse/session.rs
@@ -284,10 +284,8 @@ impl ParseSess {
 // Methods that should be restricted within the parse module.
 impl ParseSess {
     pub(super) fn emit_diagnostics(&self, diagnostics: Vec<Diagnostic>) {
-        for mut diagnostic in diagnostics {
-            self.parse_sess
-                .span_diagnostic
-                .emit_diagnostic(&mut diagnostic);
+        for diagnostic in diagnostics {
+            self.parse_sess.span_diagnostic.emit_diagnostic(diagnostic);
         }
     }