[plt-scheme] module-begin change in 203->204?

    I think this changed in 203->204.  The following example
definitely behaves differently under 202 vs 204.  204 will error this,
whereas earlier will evaluate it.  Was it an intentional effect?  I
happen to be relying on this in my present hacking.

(module langdata mzscheme
  (provide b)
  (define b 27))

(module modlang mzscheme
  (provide (all-from-except mzscheme #%module-begin))

  (provide (rename my-modbegin #%module-begin))
  (define-syntax (my-modbegin stx)
    (syntax-case stx ()
      ((_ F E ...)
       #'(#%module-begin
	  (require "langdata.ss")
	  F E ...
	  ))))
  )

(module uselang "modlang.ss"
  (printf "Is this 27? ~a~n" b)
  )