Andy & Jim - thank you! This explains the whole thing perfectly.
Piotr
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As Andy indicated, it is almost never a good idea to wrap something
mutable in a reference type simply because the guarantees of references
do not hold for mutable things. In other words, the thing the ref points
to can be changed without going through the ref which defeats the whole
purpose of
Piotr:
The most direct answer to your specific question is that aset-int modifies the
array, and returns the value 9. The return value 9 is what the ref r is being
set to after the (dosync (alter ...)) call.
However, there is a bigger issue here. Even if you replace aset-int with a
different
