Resynthesize constructor initializers from Kernel.

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

 // Copyright (c) 2015, 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.
 
 library test.src.serialization.elements_test;
 
 import 'dart:async';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_resolution_map.dart';
@@ skipping 4313 matching lines @@
         x/*location: test.dart;C;x*/ = 42;
 }
 ''');
   }
 
   test_constructor_initializers_field_notConst() async {
     variablesWithNotConstInitializers.add('x');
     var library = await checkLibrary('''
 class C {
   final x;
-  const A() : x = foo();
+  const C() : x = foo();
 }
 int foo() => 42;
 ''', allowErrors: true);
     checkElementText(library, r'''
 class C {
   final dynamic x;
   const C() :
         x/*location: test.dart;C;x*/ =
         $$invalidConstExpr$$/*location: null*/;
 }
@@ skipping 31 matching lines @@
 class A {
   const A.aaa(int p);
 }
 class C extends A {
   const C() : super.
         aaa/*location: test.dart;A;aaa*/(42);
 }
 ''');
   }
 
+  test_constructor_initializers_superInvocation_named_underscore() async {
+    var library = await checkLibrary('''
+class A {
+  const A._();
+}
+class B extends A {
+  const B() : super._();
+}
+''');
+    checkElementText(library, r'''
+class A {
+  const A._();
+}
+class B extends A {
+  const B() : super.
+        _/*location: test.dart;A;_*/();
+}
+''');
+  }
+
   test_constructor_initializers_superInvocation_namedExpression() async {
     var library = await checkLibrary('''
 class A {
   const A.aaa(a, {int b});
 }
 class C extends A {
   const C() : super.aaa(1, b: 2);
 }
 ''');
     checkElementText(library, r'''
@@ skipping 476 matching lines @@
     var library = await checkLibrary('''
 class C {
   final x;
   C() : x = new D();
 }
 class D {
   final x;
   D() : x = new C();
 }
 ''');
-    checkElementText(library, r'''
+    if (isSharedFrontEnd) {
+      // The shared front-end keeps initializers for cycled constructors.
+      checkElementText(library, r'''
+class C {
+  final dynamic x;
+  C() :
+        x/*location: test.dart;C;x*/ = new
+        D/*location: test.dart;D*/();
+}
+class D {
+  final dynamic x;
+  D() :
+        x/*location: test.dart;D;x*/ = new
+        C/*location: test.dart;C*/();
+}
+''');
+    } else {
+      checkElementText(library, r'''
 class C {
   final dynamic x;
   C();
 }
 class D {
   final dynamic x;
   D();
 }
 ''');
+    }
   }
 
   test_defaultValue_refersToGenericClass_constructor() async {
     var library = await checkLibrary('''
 class B<T> {
   const B();
 }
 class C<T> {
   const C([B<T> b = const B()]);
 }
@@ skipping 4954 matching lines @@
       fail('Unexpectedly tried to get unlinked summary for $uri');
     }
     return serializedUnit;
   }
 
   @override
   bool hasLibrarySummary(String uri) {
     return true;
   }
 }