[Extract Method] When no selection, check for implicitly selected closure.

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.
 
 import 'dart:async';
 
 import 'package:analysis_server/src/services/correction/status.dart';
 import 'package:analysis_server/src/services/refactoring/extract_method.dart';
 import 'package:analysis_server/src/services/refactoring/refactoring.dart';
 import 'package:analyzer_plugin/protocol/protocol_common.dart';
@@ skipping 841 matching lines @@
   }
 
   res(x) {
     print(x);
     return x * k;
   }
 }
 ''');
   }
 
+  test_closure_atArgumentName() async {
+    await indexTestUnit('''
+void process({int fff(int x)}) {}
+class C {
+  main() {
+    process(fff: (int x) => x * 2);
+  }
+}
+''');
+    _createRefactoring(findOffset('ff: (int x)'), 0);
+    // apply refactoring
+    return _assertSuccessfulRefactoring('''
+void process({int fff(int x)}) {}
+class C {
+  main() {
+    process(fff: res);
+  }
+
+  int res(int x) => x * 2;
+}
+''');
+  }
+
+  test_closure_atParameters() async {
+    await indexTestUnit('''
+void process(num f(int x)) {}
+class C {
+  main() {
+    process((int x) => x * 2);
+  }
+}
+''');
+    _createRefactoring(findOffset('x) =>'), 0);
+    // apply refactoring
+    return _assertSuccessfulRefactoring('''
+void process(num f(int x)) {}
+class C {
+  main() {
+    process(res);
+  }
+
+  num res(int x) => x * 2;
+}
+''');
+  }
+
   test_closure_bad_referencesLocalVariable() async {
     await indexTestUnit('''
 process(f(x)) {}
 main() {
   int k = 2;
   process((x) => x * k);
 }
 ''');
     _createRefactoringForString('(x) => x * k');
     // check
@@ skipping 1961 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();
   }
 }