Add LibraryElementForLink.isDartCore.

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

 // Copyright (c) 2016, 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.
 
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/summary/format.dart';
 import 'package:analyzer/src/summary/link.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../reflective_tests.dart';
@@ skipping 436 matching lines @@
         linker
             .getLibrary(linkerInputs.testDartUri)
             .getContainedName('b')
             .asTypeInferenceNode
             .variableElement
             .inferredType
             .toString(),
         'int');
   }
 
+  void test_leastUpperBound_functionAndClass() {
+    createLinker('''
+class C {}
+void f() {}
+var x = {
+  'C': C,
+  'f': f
+};
+''');
+    LibraryElementForLink library = linker.getLibrary(linkerInputs.testDartUri);
+    library.libraryCycleForLink.ensureLinked();
+    // No assertions--just make sure it doesn't crash.
+  }
+
   void test_libraryCycle_ignoresDependenciesOutsideBuildUnit() {
     createLinker('import "dart:async";');
     LibraryCycleForLink libraryCycle = testLibrary.libraryCycleForLink;
     expect(libraryCycle.dependencies, isEmpty);
     expect(libraryCycle.libraries, [testLibrary]);
   }
 
   void test_libraryCycle_linkEnsuresDependenciesLinked() {
     addNamedSource('/a.dart', 'import "b.dart";');
     addNamedSource('/b.dart', '');
@@ skipping 110 matching lines @@
     ParameterElementForLink g = f.parameters[0];
     FunctionType gType = g.type;
     FunctionElementForLink_FunctionTypedParam gTypeElement = gType.element;
     expect(gTypeElement.innermostExecutable, same(f));
     ParameterElementForLink h = gTypeElement.parameters[0];
     FunctionType hType = h.type;
     FunctionElementForLink_FunctionTypedParam hTypeElement = hType.element;
     expect(hTypeElement.innermostExecutable, same(f));
   }
 }