[racket] Strange difference between (define (for-syntax)) and (define-for-syntax)

[Dmitry Pavlov]

Hello,

I just came across a strange error:
#lang racket

;(require (for-syntax (only-in ffi/unsafe ctype-sizeof _pointer)))
(require-for-syntax (only-in ffi/unsafe ctype-sizeof _pointer))

(define-for-syntax (os-bitness)
  (let ((ptrsize (ctype-sizeof _pointer)))
    (case ptrsize
      ((4) 32)
      ((8) 64)
      (else (error (format "unexpected pointer size: ~a" ptrsize))))))

_pointer: unbound identifier in module (in phase 1, transformer 
environment) in: _pointer


When I put (require (for-syntax)) instead of (require-for-syntax),
the error is gone. Maybe Racket has a bug here?

I have Racket 5.3 on Debian.

Best regards,

Dmitry
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