Fix for false positive in field (not-)overriding.

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

Index: pkg/analyzer/lib/src/generated/error.dart
diff --git a/pkg/analyzer/lib/src/generated/error.dart b/pkg/analyzer/lib/src/generated/error.dart
index c13d6208740a103a6a5337487d2f924f4dc721ee..728435f22fb9414f9d53e8fb0c920bf8fff5b4e6 100644
--- a/pkg/analyzer/lib/src/generated/error.dart
+++ b/pkg/analyzer/lib/src/generated/error.dart
@@ -2698,6 +2698,7 @@ abstract class ErrorCode {
     HintCode.MISSING_RETURN,
     HintCode.NULL_AWARE_IN_CONDITION,
     HintCode.OVERRIDE_ON_NON_OVERRIDING_GETTER,
+    HintCode.OVERRIDE_ON_NON_OVERRIDING_FIELD,
     HintCode.OVERRIDE_ON_NON_OVERRIDING_METHOD,
     HintCode.OVERRIDE_ON_NON_OVERRIDING_SETTER,
     HintCode.OVERRIDE_EQUALS_BUT_NOT_HASH_CODE,
@@ -3731,6 +3732,13 @@ class HintCode extends ErrorCode {
       "Getter does not override an inherited getter");
 
   /**
+   * A field with the override annotation does not override a getter or setter.
+   */
+  static const HintCode OVERRIDE_ON_NON_OVERRIDING_FIELD = const HintCode(
+      'OVERRIDE_ON_NON_OVERRIDING_FIELD',
+      "Field does not override an inherited getter or setter");
+
+  /**
    * A method with the override annotation does not override an existing method.
    */
   static const HintCode OVERRIDE_ON_NON_OVERRIDING_METHOD = const HintCode(