I somewhat share your worries about the cleverness of the
last-userule. But my logic for adding it anyway is: A) We need to do
thisanyway as an optimization, so B) if we are already doing it, we
mightas well remove the burden of explicitly annotating moves from the
userto the compiler. I still think an explicit unary move would be
auseful addition for allowing people to write more obvious code, but
Idon't think the kind checker should complain about copies that
arealready going to be optimized to moves anyway.
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