Issue 13029. Quick fix to create a function for a Function typed named parameter.

pkg/analysis_server/lib/src/services/correction/fix_internal.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 services.src.correction.fix;
 
 import 'dart:collection';
 
 import 'package:analysis_server/src/protocol.dart' hide AnalysisError, Element,
     ElementKind;
@@ skipping 558 matching lines @@
             return;
           }
         } else {
           ClassDeclaration enclosingClass =
               node.getAncestor((node) => node is ClassDeclaration);
           targetElement =
               enclosingClass != null ? enclosingClass.element : null;
           argument = nameNode;
         }
       }
+      argument = stepUpNamedExpression(argument);
       // should be argument of some invocation
       ParameterElement parameterElement = argument.bestParameterElement;
       if (parameterElement == null) {
         return;
       }
       // should be parameter of function type
       DartType parameterType = parameterElement.type;
+      if (parameterType is InterfaceType && parameterType.isDartCoreFunction) {
+        ExecutableElement element = new MethodElementImpl('', -1);
+        parameterType = new FunctionTypeImpl.con1(element);
+      }
       if (parameterType is! FunctionType) {
         return;
       }
       FunctionType functionType = parameterType as FunctionType;
       // add proposal
       if (targetElement != null) {
         _addProposal_createFunction_method(targetElement, functionType);
       } else {
         _addProposal_createFunction_function(functionType);
       }
@@ skipping 1369 matching lines @@
 /**
  * Describes the location for a newly created [ConstructorDeclaration].
  */
 class _ConstructorLocation {
   final String _prefix;
   final int _offset;
   final String _suffix;
 
   _ConstructorLocation(this._prefix, this._offset, this._suffix);
 }