Report HintCode.UNUSED_ELEMENT for non-synthetic property accessors.

pkg/analyzer/lib/src/generated/resolver.dart

Index: pkg/analyzer/lib/src/generated/resolver.dart
diff --git a/pkg/analyzer/lib/src/generated/resolver.dart b/pkg/analyzer/lib/src/generated/resolver.dart
index 391a5c281126f966b786694ad8d489dc114fd388..28804fa33aa41240e038bce318811838220429c7 100644
--- a/pkg/analyzer/lib/src/generated/resolver.dart
+++ b/pkg/analyzer/lib/src/generated/resolver.dart
@@ -15732,6 +15732,17 @@ class _UnusedElementsVerifier extends RecursiveElementVisitor {
     super.visitMethodElement(element);
   }
 
+  @override
+  visitPropertyAccessorElement(PropertyAccessorElement element) {
+    if (!element.isSynthetic && !_isUsedMember(element)) {
+      _reportErrorForElement(
+          HintCode.UNUSED_ELEMENT,
+          element,
+          [element.kind.displayName, element.displayName]);
+    }
+    super.visitPropertyAccessorElement(element);
+  }
+
   bool _isUsedElement(Element element) {
     if (element is! LocalVariableElement) {
       if (element.isPublic) {