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

pkg/analysis_server/lib/src/services/correction/util.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.util;
 
 import 'dart:math';
 
 import 'package:analysis_server/src/protocol.dart' show SourceEdit;
 import 'package:analysis_server/src/services/correction/source_range.dart';
@@ skipping 441 matching lines @@
       AstNode parent2 = label.parent;
       if (parent2 is NamedExpression) {
         return identical(parent2.name, label);
       }
     }
   }
   return false;
 }
 
 
+/**
+ * If the given [expression] is the `expression` property of a [NamedExpression]
+ * then returns this [NamedExpression]. Otherwise returns [expression].
+ */
+Expression stepUpNamedExpression(Expression expression) {
+  if (expression != null) {
+    AstNode parent = expression.parent;
+    if (parent is NamedExpression && parent.expression == expression) {
+      return parent;
+    }
+  }
+  return expression;
+}
+
+
 class CorrectionUtils {
   final CompilationUnit unit;
 
   LibraryElement _library;
   String _buffer;
   String _endOfLine;
 
   CorrectionUtils(this.unit) {
     CompilationUnitElement unitElement = unit.element;
     this._library = unitElement.library;
@@ skipping 895 matching lines @@
 
   @override
   Object visitExpression(Expression node) {
     if (node is BinaryExpression && node.operator.type == groupOperatorType) {
       return super.visitNode(node);
     }
     operands.add(node);
     return null;
   }
 }