samples/LocalVariable.java

/*
 * Copyright 2020 The JSpecify Authors.
 *
 * 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.
 */
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;
import org.jspecify.annotations.NullnessUnspecified;

@NullMarked
abstract class LocalVariable {
  interface Super {
    String string();

    @NullnessUnspecified String stringUnspec();

    @Nullable String stringUnionNull();
  }

  abstract class Sub implements Super {
    void go() {
      String string = string();
      String stringUnspec = stringUnspec();
      String stringUnionNull = stringUnionNull();

      synchronized (string) {
      }

      // jspecify_nullness_not_enough_information
      synchronized (stringUnspec) {
      }

      // jspecify_nullness_mismatch
      synchronized (stringUnionNull) {
      }
    }
  }
}