import org.checkerframework.checker.nullness.qual.NonNull;

public class MonotonicNonNullInferenceTest {

  // :: warning: (initialization.static.field.uninitialized)
  static String staticString1;

  // :: warning: (assignment)
  static String staticString2 = null;

  static String staticString3;

  String instanceString1;

  // :: warning: (assignment)
  String instanceString2 = null;

  String instanceString3;

  static {
    // :: warning: (assignment)
    staticString3 = null;
  }

  // :: warning: (initialization.fields.uninitialized)
  MonotonicNonNullInferenceTest() {
    String instanceString3 = "hello";
  }

  static void m1(String arg) {
    staticString1 = arg;
    staticString2 = arg;
    staticString3 = arg;
  }

  void m2(String arg) {
    instanceString1 = arg;
    instanceString2 = arg;
    instanceString3 = arg;
  }

  void hasSideEffect() {}

  void testMonotonicNonNull() {
    @NonNull String s;
    if (staticString1 != null) {
      hasSideEffect();
      s = staticString1;
    }
    if (staticString2 != null) {
      hasSideEffect();
      s = staticString2;
    }
    if (staticString3 != null) {
      hasSideEffect();
      s = staticString3;
    }
    if (instanceString1 != null) {
      hasSideEffect();
      s = instanceString1;
    }
    if (instanceString2 != null) {
      hasSideEffect();
      s = instanceString2;
    }
    if (instanceString3 != null) {
      hasSideEffect();
      s = instanceString3;
    }
  }
}