[racket] flush is not enough, a list is needed

You're using just `write', so you need some whitespace between items:
>
> > (with-input-from-string
>       (with-output-to-string (λ() (write 'x) (write 'y)))
>     read)
> 'xy
>


Wow, thanks a lot, I would have never thought about that. I thought that
'write' was sending data, not mere characters.
Writing a space after each output indeed solves the problem.
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