Add LibraryElementForLink.context getter.

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/src/summary/format.dart';
 import 'package:analyzer/src/summary/link.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../reflective_tests.dart';
 import 'summarize_ast_test.dart';
@@ skipping 421 matching lines @@
     addNamedSource('/a.dart', '');
     addNamedSource('/b.dart', '');
     createLinker('import "a.dart"; import "b.dart";');
     LibraryElementForLink libA = getLibrary('file:///a.dart');
     LibraryElementForLink libB = getLibrary('file:///b.dart');
     LibraryCycleForLink libraryCycle = testLibrary.libraryCycleForLink;
     expect(libraryCycle.dependencies,
         unorderedEquals([libA.libraryCycleForLink, libB.libraryCycleForLink]));
     expect(libraryCycle.libraries, [testLibrary]);
   }
+
+  void test_multiplyInheritedExecutable_differentSignatures() {
+    createLinker('''
+class B {
+  void f() {}
 }
+abstract class I {
+   f();
+}
+class C extends B with I {}
+class D extends C {
+  void f() {}
+}
+''');
+    LibraryElementForLink library = linker.getLibrary(linkerInputs.testDartUri);
+    library.libraryCycleForLink.ensureLinked();
+    // No assertions--just make sure it doesn't crash.
+  }
+}