>
> That looks good.
> How does the body:[ ... ] part parse? Is there a way of quickly 
> 'skipping' from start '[' to the end ']' without having to parse the 
> source in the midlle with a full Smalltalk parser? It can't just skip 
> matching '[ ]' pairs, in case there are ']' embedded in strings etc. , 
> right?
You just let it compile as per normal. It has errors - but when you go 
to call the block, you reflect back to the parse tree and extract the 
source code.

It's a rather simple trick of self-reflecting code. It's kind of a shame 
that blocks don't already ahve access to their own source code like 
methods do - but whatcha gunna do :)

Michael