code: public MethodHandle nop() {
          if (type().returnType() != void.class) {
              throw new InvalidTransformException("must have void return type to nop: " + type());
          }
          return invoke(Binder
                  .from(type())
                  .drop(0, type().parameterCount())
                  .cast(Object.class)
                  .constant(null));
      }
docs: Apply all transforms to an endpoint that does absolutely nothing. Useful for
  creating exception handlers in void methods that simply ignore the exception.
  
  @return a handle that has all transforms applied and does nothing at its endpoint