langtools/test/tools/javac/generics/inference/8152832/T8152832.java

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/**
 * @test
 * @bug 8152832
 * @summary Type inference regression in javac
 * @compile T8152832.java
 */

import java.util.function.*;
import java.util.stream.*;
import java.util.*;

class T8152832 {
    interface MyStream<T> extends Stream<T> {
        public <U> List<U> toFlatList(Function<? super T, ? extends Collection<U>> mapper);
    }

    static class MyStreamSupplier<T> {
        public MyStream<T> get() {
            return null;
        }
    }

    public static <T> void myStream(Supplier<Stream<T>> base, Consumer<MyStreamSupplier<T>> consumer) {
    }

    public static void assertEquals(Object expected, Object actual) {
    }

    public void test() {
        List<List<String>> strings = Arrays.asList();
        List<String> expectedList = Arrays.asList();
        myStream(strings::stream, supplier -> {
            assertEquals(expectedList, supplier.get().toFlatList(Function.identity()));
        });
    }
}