[racket] what is this thing: '#(struct:foo 3 4) ?

On Fri, Sep 10, 2010 at 12:21 PM, John Clements
<clements at brinckerhoff.org> wrote:
> I've spent long enough with the docs on this not to feel too embarrassed about this question: what kind of value is produced by
>
> '#(struct:foo 3 4)

Just to plug Doug's excellent software:

[samth at punge:~/work plt] r
Welcome to Racket v5.0.1.5.
> (require (planet williams/describe:1:0/describe))
> (describe '#(struct:foo 3 4))
#(struct:foo 3 4) is an immutable vector of length 3

-- 
sam th
samth at ccs.neu.edu