1 /* 2 * Copyright 2020 The JSpecify Authors. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 import org.jspecify.annotations.NullMarked; 17 import org.jspecify.annotations.Nullable; 18 19 @NullMarked 20 interface ContravariantReturns { makeObject()21 Object makeObject(); 22 makeImplicitlyObjectBounded()23 Lib<? extends Object> makeImplicitlyObjectBounded(); 24 makeExplicitlyObjectBounded()25 Lib<? extends Object> makeExplicitlyObjectBounded(); 26 27 interface Subtype extends ContravariantReturns { 28 @Override 29 // jspecify_nullness_mismatch makeObject()30 @Nullable Object makeObject(); 31 32 @Override 33 // jspecify_nullness_mismatch makeImplicitlyObjectBounded()34 Lib<?> makeImplicitlyObjectBounded(); 35 36 @Override 37 // jspecify_nullness_mismatch makeExplicitlyObjectBounded()38 Lib<? extends @Nullable Object> makeExplicitlyObjectBounded(); 39 } 40 41 interface Lib<T extends @Nullable Object> {} 42 } 43