Issue 27300. Report HintCode.ABSTRACT_SUPER_MEMBER_REFERENCE.

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

Index: pkg/analyzer/lib/src/error/codes.dart
diff --git a/pkg/analyzer/lib/src/error/codes.dart b/pkg/analyzer/lib/src/error/codes.dart
index d87b593ce4f10c9467aa5edc44be8f18f8a0a109..000948ae45e3a0b9d529ee713536c0774984ba43 100644
--- a/pkg/analyzer/lib/src/error/codes.dart
+++ b/pkg/analyzer/lib/src/error/codes.dart
@@ -2204,6 +2204,19 @@ class CompileTimeErrorCode extends ErrorCode {
  */
 class HintCode extends ErrorCode {
   /**
+   * When an abstract supertype member is references with `super` as its target,
+   * it cannot be overridden, so it is always a runtime error.
+   *
+   * Parameters:
+   * 0: the display name for the kind of the referenced element
+   * 1: the name of the referenced element
+   */
+  static const HintCode ABSTRACT_SUPER_MEMBER_REFERENCE = const HintCode(
+      'ABSTRACT_SUPER_MEMBER_REFERENCE',
+      "The {0} '{1}' is always abstract in the supertype.",
+      null);
+
+  /**
    * This hint is generated anywhere where the
    * [StaticWarningCode.ARGUMENT_TYPE_NOT_ASSIGNABLE] would have been generated,
    * if we used propagated information for the warnings.