thanks for exhibiting this bug. I have corrected my sample implementation. I will soon ask Arthur to publish the next draft, which will include the corrected implementation.
The first make-foo is an error so it's ok if it works or not (raise an
error would be preferable, though).
However the last make-bar and its
accessor, I thought, should print 3 and 4. It didn't work if I make
make-bar definition to (make-bar c d), either.
There has been in fact an error in the sample implementation.
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