Resynthesize top-level function references.

pkg/analyzer/test/src/summary/resynthesize_test.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 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/dart/element/element.dart';
@@ skipping 1395 matching lines @@
 class C {
   static int m(int a, String b) => 42;
 }
 ''');
     checkLibrary(r'''
 import 'a.dart' as p;
 const V = p.C.m;
 ''');
   }
 
+  test_const_reference_topLevelFunction() {
+    shouldCompareConstValues = true;
+    checkLibrary(r'''
+foo() {}
+const V = foo;
+''');
+  }
+
+  test_const_reference_topLevelFunction_imported() {
+    shouldCompareConstValues = true;
+    addLibrarySource(
+        '/a.dart',
+        r'''
+foo() {}
+''');
+    checkLibrary(r'''
+import 'a.dart';
+const V = foo;
+''');
+  }
+
+  test_const_reference_topLevelFunction_imported_withPrefix() {
+    shouldCompareConstValues = true;
+    addLibrarySource(
+        '/a.dart',
+        r'''
+foo() {}
+''');
+    checkLibrary(r'''
+import 'a.dart' as p;
+const V = p.foo;
+''');
+  }
+
   test_const_reference_topLevelVariable() {
     shouldCompareConstValues = true;
     checkLibrary(r'''
 const A = 1;
 const B = A + 2;
 ''');
   }
 
   test_const_reference_topLevelVariable_imported() {
     shouldCompareConstValues = true;
@@ skipping 1159 matching lines @@
       fail('Unexpectedly tried to get unlinked summary for $uri');
     }
     return serializedUnit;
   }
 
   @override
   bool hasLibrarySummary(String uri) {
     return true;
   }
 }