code: @Deprecated
    public static Parser<?> runnable(final Runnable runnable) {
      return new Parser<Object>() {      
        @Override boolean apply(ParseContext ctxt) {
          runnable.run();
          return true;
        }
        
        @Override public String toString() {
          return runnable.toString();
        }
      };
    }
docs: A {@link Parser} that always succeeds and invokes {@code runnable}.