AnalysisErrorWithProperties cannot be reported with the new analysis driver.

pkg/analysis_server/lib/src/services/correction/fix_internal.dart

Index: pkg/analysis_server/lib/src/services/correction/fix_internal.dart
diff --git a/pkg/analysis_server/lib/src/services/correction/fix_internal.dart b/pkg/analysis_server/lib/src/services/correction/fix_internal.dart
index 1a886be1a06d946ff5b14673bdc32d68b9e69a99..1a521ff2c2cdbced260576a213ec67ee87cf0285 100644
--- a/pkg/analysis_server/lib/src/services/correction/fix_internal.dart
+++ b/pkg/analysis_server/lib/src/services/correction/fix_internal.dart
@@ -285,15 +285,15 @@ class FixProcessor {
                 .NON_ABSTRACT_CLASS_INHERITS_ABSTRACT_MEMBER_FIVE_PLUS) {
       // make class abstract
       _addFix_makeEnclosingClassAbstract();
-      // implement methods
-      AnalysisErrorWithProperties errorWithProperties =
-          error as AnalysisErrorWithProperties;
-      Object property =
-          errorWithProperties.getProperty(ErrorProperty.UNIMPLEMENTED_METHODS);
-      List<ExecutableElement> missingOverrides =
-          property as List<ExecutableElement>;
-      _addFix_createMissingOverrides(missingOverrides);
       _addFix_createNoSuchMethod();
+      // implement methods
+      if (error is AnalysisErrorWithProperties) {

[Paul Berry, 2016/11/28 18:41:35]

Would you mind adding a "TODO" comment to remind us of the issue this is working
around?

[scheglov, 2016/11/28 18:44:13]

Done.

+        AnalysisErrorWithProperties errorWithProperties =
+            error as AnalysisErrorWithProperties;
+        List<ExecutableElement> missingOverrides = errorWithProperties
+            .getProperty(ErrorProperty.UNIMPLEMENTED_METHODS);
+        _addFix_createMissingOverrides(missingOverrides);
+      }
     }
     if (errorCode == StaticWarningCode.CAST_TO_NON_TYPE ||
         errorCode == StaticWarningCode.TYPE_TEST_WITH_UNDEFINED_NAME ||