test/langtools/tools/javac/generics/inference/NestedCapture.java

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 *
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/*
 * @test
 * @bug 8039214
 * @summary Capture variable passed through multiple levels of nested inference
 * @compile NestedCapture.java
 * @compile -Xlint:-options -source 7 NestedCapture.java
 */

abstract class NestedCapture {
  interface List<T> {}
  abstract <T> List<T> copyOf(List<? extends T> lx);
  abstract <E> List<E> filter(List<E> lx);

  <U> void test1(List<U> lx) {
    copyOf(filter(lx));
  }

  void test2(List<?> lx) {
    copyOf(filter(lx));
  }

}