Issue 11892. It is compile-time error when unqualified invocation with unresolved identifier.

editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/error/StaticTypeWarningCode.java

 /*
  * Copyright (c) 2013, the Dart project authors.
  * 
  * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
  * in compliance with the License. You may obtain a copy of the License at
  * 
  * http://www.eclipse.org/legal/epl-v10.html
  * 
  * Unless required by applicable law or agreed to in writing, software distributed under the License
  * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
@@ skipping 154 matching lines @@
    * 7.6.2 Factories: It is a static type warning if any of the type arguments to <i>k'</i> are not
    * subtypes of the bounds of the corresponding formal type parameters of type.
    * 
    * @param boundedTypeName the name of the type used in the instance creation that should be
    *          limited by the bound as specified in the class declaration
    * @param boundingTypeName the name of the bounding type
    */
   TYPE_ARGUMENT_NOT_MATCHING_BOUNDS("'%s' does not extend '%s'"),
 
   /**
-   * Specification reference needed. This is equivalent to {@link #UNDEFINED_METHOD}, but for
-   * top-level functions.
-   * 
-   * @param methodName the name of the method that is undefined
-   */
-  UNDEFINED_FUNCTION("The function '%s' is not defined"),
-
-  /**
    * 12.17 Getter Invocation: Let <i>T</i> be the static type of <i>e</i>. It is a static type
    * warning if <i>T</i> does not have a getter named <i>m</i>.
    * 
    * @param getterName the name of the getter
    * @param enclosingType the name of the enclosing type where the getter is being looked for
    */
   UNDEFINED_GETTER("There is no such getter '%s' in '%s'"),
 
   /**
    * 12.15.1 Ordinary Invocation: Let <i>T</i> be the static type of <i>o</i>. It is a static type
@@ skipping 78 matching lines @@
   @Override
   public String getMessage() {
     return message;
   }
 
   @Override
   public ErrorType getType() {
     return ErrorType.STATIC_TYPE_WARNING;
   }
 }