Issue 21375. Fix for FunctionTypeAliasElement-based FunctionType source.

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

Index: pkg/analysis_server/test/services/refactoring/extract_method_test.dart
diff --git a/pkg/analysis_server/test/services/refactoring/extract_method_test.dart b/pkg/analysis_server/test/services/refactoring/extract_method_test.dart
index 8001fc0f8663b544520c404c13899e8dec4cd142..67e46cc94632280ac070e36e919593c7610bd0de 100644
--- a/pkg/analysis_server/test/services/refactoring/extract_method_test.dart
+++ b/pkg/analysis_server/test/services/refactoring/extract_method_test.dart
@@ -9,9 +9,9 @@ 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';
 
 
@@ -1323,6 +1323,25 @@ class A {
 ''');
   }
 
+  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() {