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Author: bend-n

compiler/rustc_mir_transform/src/check_unnecessary_transmutes.rs

@@ -92,10 +92,8 @@ impl<'tcx> Visitor<'tcx> for UnnecessaryTransmuteChecker<'_, 'tcx> {
                 self.tcx.sess.source_map().span_to_snippet(arg).expect("ok"),
                 span,
             )
-            && let Some(call_id) = self.body.source.def_id().as_local()
+            && let Some(hir_id) = terminator.source_info.scope.lint_root(&self.body.source_scopes)
         {
-            let hir_id = self.tcx.local_def_id_to_hir_id(call_id);
-
             self.tcx.emit_node_span_lint(UNNECESSARY_TRANSMUTATE, hir_id, span, lint);
         }
     }

tests/ui/transmute/redundant-transmutation.stderr

@@ -9,7 +9,7 @@ note: the lint level is defined here
   --> $DIR/redundant-transmutation.rs:2:9
    |
 LL | #![deny(unnecessary_transmutate)]
-   |         ^^^^^^^^^^^^^^^^^^^^^^^^^
+   |         ^^^^^^^^^^^^^^^^^^^^^^^
 
 error: unnecessary transmute
   --> $DIR/redundant-transmutation.rs:13:22