Add support for ConstructorElementImpl.isCycleFree to summaries.

pkg/analyzer/test/src/summary/summary_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 analyzer.test.src.summary.summary_common;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/dart/scanner/reader.dart';
@@ skipping 3782 matching lines @@
         executables: serializeClassText('class C { C(); }').executables);
     expect(executable.returnType, isNull);
   }
 
   test_constructor_return_type_parameterized() {
     UnlinkedExecutable executable = findExecutable('',
         executables: serializeClassText('class C<T, U> { C(); }').executables);
     expect(executable.returnType, isNull);
   }
 
+  test_constructor_withCycles_const() {
+    serializeLibraryText('''
+class C {
+  final x;
+  const C() : x = const D();
+}
+class D {
+  final x;
+  const D() : x = const C();
+}
+class E {
+  final x;
+  const E() : x = null;
+}
+''');
+    int classCConstCycleSlot = findClass('C').executables[0].constCycleSlot;
+    expect(classCConstCycleSlot, isNot(0));
+    int classDConstCycleSlot = findClass('D').executables[0].constCycleSlot;
+    expect(classDConstCycleSlot, isNot(0));
+    int classEConstCycleSlot = findClass('E').executables[0].constCycleSlot;
+    expect(classEConstCycleSlot, isNot(0));
+    if (!skipFullyLinkedData) {
+      expect(definingUnit.constCycles, contains(classCConstCycleSlot));
+      expect(definingUnit.constCycles, contains(classDConstCycleSlot));
+      expect(definingUnit.constCycles, isNot(contains(classEConstCycleSlot)));
+    }
+  }
+
+  test_constructor_withCycles_nonConst() {
+    serializeLibraryText('''
+class C {
+  final x;
+  C() : x = new D();
+}
+class D {
+  final x;
+  D() : x = new C();
+}
+''');
+    expect(findClass('C').executables[0].constCycleSlot, 0);
+    expect(findClass('D').executables[0].constCycleSlot, 0);
+  }
+
   test_dependencies_export_to_export_unused() {
     addNamedSource('/a.dart', 'export "b.dart";');
     addNamedSource('/b.dart', '');
     serializeLibraryText('export "a.dart";');
     // The main test library depends on b.dart, even though it doesn't
     // re-export any names defined in b.dart, because a change to b.dart might
     // cause it to start exporting a name that the main test library *does*
     // use.
     checkHasDependency(absUri('/b.dart'), 'b.dart');
   }
@@ skipping 3629 matching lines @@
 class _PrefixExpectation {
   final ReferenceKind kind;
   final String name;
   final String absoluteUri;
   final String relativeUri;
   final int numTypeParameters;
 
   _PrefixExpectation(this.kind, this.name,
       {this.absoluteUri, this.relativeUri, this.numTypeParameters: 0});
 }