Support for NamedExpression(s) as constructor initializer arguments.

pkg/analyzer/test/src/summary/resynthesize_test.dart

Index: pkg/analyzer/test/src/summary/resynthesize_test.dart
diff --git a/pkg/analyzer/test/src/summary/resynthesize_test.dart b/pkg/analyzer/test/src/summary/resynthesize_test.dart
index 433f6933b6bedfec64f81677c453586840f615fa..bd86e798a8e47bdac984cb803afde8849d9da9cf 100644
--- a/pkg/analyzer/test/src/summary/resynthesize_test.dart
+++ b/pkg/analyzer/test/src/summary/resynthesize_test.dart
@@ -2476,6 +2476,17 @@ class C extends A {
 ''');
   }
 
+  test_constructor_initializers_superInvocation_namedExpression() {
+    checkLibrary('''
+class A {
+  const A.aaa(a, {int b});
+}
+class C extends A {
+  const C() : super.aaa(1, b: 2);
+}
+''');
+  }
+
   test_constructor_initializers_superInvocation_unnamed() {
     checkLibrary('''
 class A {