// @skip-test until Issue 979 is fixed.

import java.util.function.Supplier;
import org.checkerframework.checker.nullness.qual.NonNull;
import org.checkerframework.checker.nullness.qual.Nullable;

public class SimpleLambda {
    <T> T perform(Supplier<T> p) {
        return p.get();
    }

    void test() {
        @Nullable String s1 = perform(() -> (String) null);
        @Nullable String s2 = this.<@Nullable String>perform(() -> (String) null);
        @NonNull String s3 = perform(() -> "");
    }
}