Add preliminary local function reference support to the AST summary linker.

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

Index: pkg/analyzer/test/src/summary/linker_test.dart
diff --git a/pkg/analyzer/test/src/summary/linker_test.dart b/pkg/analyzer/test/src/summary/linker_test.dart
index 38838767ffd7480b17d673a9b2d95ed4b711e8d1..c492f2333ec532d3f61a8a72436a850d94b07cd8 100644
--- a/pkg/analyzer/test/src/summary/linker_test.dart
+++ b/pkg/analyzer/test/src/summary/linker_test.dart
@@ -150,6 +150,28 @@ const x = [const C()];
     expect(classC.unnamedConstructor.isCycleFree, false);
   }
 
+  void test_inferredType_closure_fromBundle() {
+    var bundle = createPackageBundle(
+        '''
+var x = () {};
+''',
+        path: '/a.dart');
+    addBundle(bundle);
+    createLinker('''
+import 'a.dart';
+var y = x;
+''');
+    LibraryElementForLink library = linker.getLibrary(linkerInputs.testDartUri);
+    expect(
+        library
+            .getContainedName('y')
+            .asTypeInferenceNode
+            .variableElement
+            .inferredType
+            .toString(),
+        '() → dynamic');
+  }
+
   void test_inferredType_instanceField_dynamic() {
     createLinker('''
 var x;