/*
 * Copyright 2011 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * 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 or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.errorprone.matchers;

import com.google.errorprone.VisitorState;
import com.sun.source.tree.Tree;
import java.io.Serializable;

/**
 * Define a predicate on a {@link Tree}, which also accesses the state of AST traversal.
 * @param <T> a javac AST node
 * @author alexeagle@google.com (Alex Eagle)
 */
public interface Matcher<T extends Tree> extends Serializable {
  boolean matches(T t, VisitorState state);
}

@@ -850,16 +850,19 @@
 versal.%0A
+ *%0A
  * @para
@@ -933,16 +933,37 @@
 le)%0A */%0A
+@FunctionalInterface%0A
 public i

Tag Matcher with @FunctionalInterface