[racket] nested require modules and global variable

From: Danny Yoo (dyoo at cs.wpi.edu)
Date: Sun Dec 18 17:36:00 EST 2011

On Sunday, December 18, 2011, Niitsuma Hirotaka <hirotaka.niitsuma at gmail.com>
> How about this?
> http://d.hatena.ne.jp/niitsuma/20081113/1324207362
> I add some comment

Ok, thanks for posting that code.

Do you expect modules to be re-invoked on every require?  I am trying to
understand your concern about "valid behavior".

The model I have with regards to modules is this: modules can be "required"
from many different modules, but they are "invoked" just once.

So I if I have files A.rkt, B.rkt, and C.rkt, which all look like this:

;; a.rkt
#lang racket
(printf "hi, this is A\n")

;; b.rkt
#lang racket
(require "a.rkt")
(printf "hi, this is B\n")

;; c.rkt
#lang racket
(require "a.rkt")
(require "b.rkt")
(printf "hi, this is C\n")

Then I expect to see the following output when I run c.rkt:

    hi, this is A
    hi, this is B
    hi, this is C

Does my expectation surprise you, or does this match what you'd expect as
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