Apply transformations after comparing to golden files.

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

Index: pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart
index 8c96d393783ad53ba4043da27a4b8a9d02cef848..58a8ff93caf764024a1ad7df87b417edcbb576df 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart
@@ -281,6 +281,11 @@ abstract class KernelComplexAssignment extends Expression
 
   KernelComplexAssignment(this.rhs);
 
+  void set parent(TreeNode node) {
+    super.parent = node;
+    desugared?.parent = node;
+  }
+
   @override
   accept(ExpressionVisitor v) => desugared.accept(v);