[plt-scheme] _bytes doesn't work as a simple ctype

Hi,

"PLT Foreign Interface Manual" says that
_bytes can be used as a simple ctype as well as a custom-type macro.

But the following code generates an error.

-----------------------------------------------------------------------
(let ((ptr (malloc _byte 128))
      (data (make-bytes 16 0)))
  (ptr-set! _bytes 0 data))
-----------------------------------------------------------------------

The error message displayed in DrScheme is:

-----------------------------------------------------------------------
procedure application: expected procedure, given: #f; 
arguments were: #<struct:fun-syntax> #<syntax:22:12>
-----------------------------------------------------------------------

This may be _bytes are considered as a custom-type macro.
How can I use _bytes as a simple type in the above context ?

I think it is more convenient to separate a simple ctype 
from custom-type macro as separate symbols.


Chihiro Kuraya
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