[racket] ] Converting symbols to procedures?

Deren wrote:

> Don't quote. You want to pass the class in a list, pass the class in a list.

You can also quasiquote and unquote. (list + *) can be written `(,+ ,*). 
This is overkill for such a small example, but is useful if you want to 
mix literal quotation and expressions while maintaining the readability 
of quote. --PR