Apply transformations after comparing to golden files.

pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// This file declares a "shadow hierarchy" of concrete classes which extend
 /// the kernel class hierarchy, adding methods and fields needed by the
 /// BodyBuilder.
 ///
 /// Instances of these classes may be created using the factory methods in
 /// `ast_factory.dart`.
@@ skipping 263 matching lines @@
   /// Indicates whether the expression arose from a post-increment or
   /// post-decrement.
   bool isPostIncDec = false;
 
   /// Indicates whether the expression arose from a pre-increment or
   /// pre-decrement.
   bool isPreIncDec = false;
 
   KernelComplexAssignment(this.rhs);
 
+  void set parent(TreeNode node) {
+    super.parent = node;
+    desugared?.parent = node;
+  }
+
   @override
   accept(ExpressionVisitor v) => desugared.accept(v);
 
   @override
   accept1(ExpressionVisitor1 v, arg) => desugared.accept1(v, arg);
 
   @override
   DartType getStaticType(TypeEnvironment types) =>
       desugared.getStaticType(types);
 
@@ skipping 1843 matching lines @@
   }
 
   transformChildren(v) {
     return internalError("Internal error: Unsupported operation.");
   }
 
   visitChildren(v) {
     return internalError("Internal error: Unsupported operation.");
   }
 }