/*

 * @test /nodynamiccopyright/

 * @summary Negative regression test from odersky

 * @author odersky

 *

 * @compile/fail/ref=BadTest.out -XDrawDiagnostics  BadTest.java

 */

class BadTest {

    static class Main {

        static <B> List<B> nil() { return new List<B>(); }

        static <A> List<A> cons(A x, List<A> xs) { return xs.prepend(x); }

        static <A> Cell<A> makeCell(A x) { return new Cell<A>(x); }

        static <A> A id(A x) { return x; }

        public static void main(String[] args) {

            List<Cell<String>> as = nil().prepend(makeCell(null));

            List<Cell<String>> bs = cons(makeCell(null), nil());

            List<String> xs = id(nil());

            List<String> ys = cons("abc", id(nil()));

            List<String> zs = id(nil()).prepend("abc");

            List<Cell<String>> us = id(nil()).prepend(makeCell(null));

            List<Cell<String>> vs = cons(makeCell(null), id(nil()));

            System.out.println(nil() instanceof List<String>);

            nil();

        }

    }

}