Issue 22962. Adding/removing method/accessor body is a declartion mismatch.

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

Index: pkg/analyzer/lib/src/generated/element_handle.dart
diff --git a/pkg/analyzer/lib/src/generated/element_handle.dart b/pkg/analyzer/lib/src/generated/element_handle.dart
index 4b68e8e13da244d04643ae6f3bfcc93d040d6fae..d29787ea33e8b2f95280ecbb4b8784958097dbf7 100644
--- a/pkg/analyzer/lib/src/generated/element_handle.dart
+++ b/pkg/analyzer/lib/src/generated/element_handle.dart
@@ -502,6 +502,9 @@ abstract class ExecutableElementHandle extends ElementHandle
   List<FunctionElement> get functions => actualElement.functions;
 
   @override
+  bool get isAbstract => actualElement.isAbstract;
+
+  @override
   bool get isAsynchronous => actualElement.isAsynchronous;
 
   @override
@@ -853,9 +856,6 @@ class MethodElementHandle extends ExecutableElementHandle
   ClassElement get enclosingElement => super.enclosingElement as ClassElement;
 
   @override
-  bool get isAbstract => actualElement.isAbstract;
-
-  @override
   bool get isStatic => actualElement.isStatic;
 
   @override
@@ -952,9 +952,6 @@ class PropertyAccessorElementHandle extends ExecutableElementHandle
       actualElement.correspondingSetter;
 
   @override
-  bool get isAbstract => actualElement.isAbstract;
-
-  @override
   bool get isGetter => actualElement.isGetter;
 
   @override