Issue 13918. final fields induce setters that are illegal to call

editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/element/PropertyAccessorElementImpl.java

 /*
  * Copyright (c) 2012, 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 93 matching lines @@
   public PropertyInducingElement getVariable() {
     return variable;
   }
 
   @Override
   public boolean isAbstract() {
     return hasModifier(Modifier.ABSTRACT);
   }
 
   @Override
+  public boolean isExcludedSetter() {
+    return isSetter() && variable.isFinal();
+  }
+
+  @Override
   public boolean isGetter() {
     return hasModifier(Modifier.GETTER);
   }
 
   @Override
   public boolean isSetter() {
     return hasModifier(Modifier.SETTER);
   }
 
   @Override
@@ skipping 46 matching lines @@
     this.variable = variable;
   }
 
   @Override
   protected void appendTo(StringBuilder builder) {
     builder.append(isGetter() ? "get " : "set ");
     builder.append(getVariable().getDisplayName());
     super.appendTo(builder);
   }
 }