Lambda Javac Bug

JavacBug.java

package lambda;

public class JavacBug {
  interface Function<T, V> extends PartialFunction<T, V> {
    V apply(T paramT);
  }

  interface PartialFunction<T, V> {
    V apply(T paramT) throws Exception;
  }

  interface Runner {
    <T> T run(Function<? super Object, T> tFunction);
  }

  public static void main(String[] args) {
    Runner runner = null;
    runner.run(tx -> {
      tx.hashCode();
      return null;
    });
  }
}