[racket] ffi/unsafe and free

At Thu, 26 Jan 2012 11:10:16 +1100, Neil Caldwell wrote:
> #lang racket
> 
> (require ffi/unsafe)
> 
> (free (malloc _pointer))

By default, `malloc' allocates memory that is managed by the Racket
garbage collector instead of the C library.

Specify 'raw mode to use the C library's malloc():

 #lang racket
 (require ffi/unsafe)

 (free (malloc _pointer 'raw))