[plt-scheme] Scoping of define/kw

Hi all,

This is an easy one, and perhaps there's a historic RTFM that's called 
for. Because I'm lazy, I've asked here... perhaps that's a bad thing.

In:
---
(define/kw (extract-and-get-meta strukt strukt-key
                                    #:key  [ethunk
                                            (lambda ()
                                              (error 'get-meta "No 
metadata: ~a" strukt-key))])
              (let ([m (node-meta strukt)])
                (hash-table-get m strukt-key ethunk)))
---

This code compiles under v350, but dies under 300/301.5 (those are the 
two previous versions I have laying around). It would appear that 
'strukt-key' is in scope of the keyword parameter 'ethunk', but not in 
scope in 300/301?

I encountered this by mistake/happenstance, but thought I'd ask just the 
same.

Cheers,
M