Issue 21375. Fix for FunctionTypeAliasElement-based FunctionType source.

pkg/analysis_server/test/services/refactoring/extract_method_test.dart

 // Copyright (c) 2014, 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.services.refactoring.extract_method;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/services/refactoring/extract_method.dart';
 import 'package:analysis_server/src/services/refactoring/refactoring.dart';
-import '../../reflective_tests.dart';
 import 'package:unittest/unittest.dart';
 
+import '../../reflective_tests.dart';
 import 'abstract_refactoring.dart';
 
 
 main() {
   groupSep = ' | ';
   runReflectiveTests(ExtractMethodTest);
 }
 
 
 @ReflectiveTestCase()
@@ skipping 1291 matching lines @@
 class A {
   myMethod() {
     int v1 = 1;
     int v2 = 2;
     int positiveB = res(v1, v2);
   }
 }
 ''');
   }
 
+  test_singleExpression_parameter_functionTypeAlias() {
+    indexTestUnit('''
+typedef R Foo<S, R>(S s);
+void main(Foo<String, int> foo, String s) {
+  int a = foo(s);
+}
+''');
+    _createRefactoringForString('foo(s)');
+    // apply refactoring
+    return _assertSuccessfulRefactoring('''
+typedef R Foo<S, R>(S s);
+void main(Foo<String, int> foo, String s) {
+  int a = res(foo, s);
+}
+
+int res(Foo<String, int> foo, String s) => foo(s);
+''');
+  }
+
   test_singleExpression_returnTypeGeneric() {
     indexTestUnit('''
 main() {
   var v = new List<String>();
 }
 ''');
     _createRefactoringForString('new List<String>()');
     // apply refactoring
     return _assertSuccessfulRefactoring('''
 main() {
@@ skipping 972 matching lines @@
    * Returns a deep copy of [refactoring] parameters.
    * There was a bug masked by updating parameter instances shared between the
    * refactoring and the test.
    */
   List<RefactoringMethodParameter> _getParametersCopy() {
     return refactoring.parameters.map((p) {
       return new RefactoringMethodParameter(p.kind, p.type, p.name, id: p.id);
     }).toList();
   }
 }