1 /* 2 * Copyright 2022 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 import org.jspecify.annotations.NullnessUnspecified; 19 20 @NullMarked 21 abstract class ExtendsSameType { 22 interface Foo {} 23 24 interface Lib<T> {} 25 26 interface Supplier<T extends @Nullable Object> {} 27 use(Lib<Supplier<? extends Foo>> l)28 abstract void use(Lib<Supplier<? extends Foo>> l); 29 useUnspec(Lib<Supplier<? extends @NullnessUnspecified Foo>> l)30 abstract void useUnspec(Lib<Supplier<? extends @NullnessUnspecified Foo>> l); 31 useUnionNull(Lib<Supplier<? extends @Nullable Foo>> l)32 abstract void useUnionNull(Lib<Supplier<? extends @Nullable Foo>> l); 33 client(Lib<Supplier<? extends Foo>> l)34 void client(Lib<Supplier<? extends Foo>> l) { 35 use(l); 36 // jspecify_nullness_not_enough_information 37 useUnspec(l); 38 // jspecify_nullness_mismatch 39 useUnionNull(l); 40 } 41 clientUnspec(Lib<Supplier<? extends @NullnessUnspecified Foo>> l)42 void clientUnspec(Lib<Supplier<? extends @NullnessUnspecified Foo>> l) { 43 // jspecify_nullness_not_enough_information 44 use(l); 45 // jspecify_nullness_not_enough_information 46 useUnspec(l); 47 // jspecify_nullness_not_enough_information 48 useUnionNull(l); 49 } 50 clientUnionNull(Lib<Supplier<? extends @Nullable Foo>> l)51 void clientUnionNull(Lib<Supplier<? extends @Nullable Foo>> l) { 52 // jspecify_nullness_mismatch 53 use(l); 54 // jspecify_nullness_not_enough_information 55 useUnspec(l); 56 useUnionNull(l); 57 } 58 } 59