Use correct lint

compiler/rustc_passes/src/dead.rs

@@ -805,11 +805,17 @@ impl<'tcx> DeadVisitor<'tcx> {
         };
         let tcx = self.tcx;
 
+        let lint = if is_positional {
+            lint::builtin::UNUSED_TUPLE_STRUCT_FIELDS
+        } else {
+            lint::builtin::DEAD_CODE
+        };
+
         let first_hir_id = tcx.local_def_id_to_hir_id(first_id);
-        let first_lint_level = tcx.lint_level_at_node(lint::builtin::DEAD_CODE, first_hir_id).0;
+        let first_lint_level = tcx.lint_level_at_node(lint, first_hir_id).0;
         assert!(dead_codes.iter().skip(1).all(|id| {
             let hir_id = tcx.local_def_id_to_hir_id(*id);
-            let level = tcx.lint_level_at_node(lint::builtin::DEAD_CODE, hir_id).0;
+            let level = tcx.lint_level_at_node(lint, hir_id).0;
             level == first_lint_level
         }));
 
@@ -835,12 +841,6 @@ impl<'tcx> DeadVisitor<'tcx> {
         let multiple = num > 6;
         let name_list = names.into();
 
-        let lint = if is_positional {
-            lint::builtin::UNUSED_TUPLE_STRUCT_FIELDS
-        } else {
-            lint::builtin::DEAD_CODE
-        };
-
         let parent_info = if let Some(parent_item) = parent_item {
             let parent_descr = tcx.def_descr(parent_item.to_def_id());
             let span = if let DefKind::Impl { .. } = tcx.def_kind(parent_item) {

tests/ui/lint/dead-code/issue-119267.rs

@@ -0,0 +1,9 @@
+// run-pass
+
+#[derive(Debug)]
+struct Foo(i32);
+
+#[derive(Debug)]
+struct ConstainsDropField(Foo, #[allow(unused)] Foo);
+
+fn main() {}