Hello,
> > Just a bit of minor academic nitpicking...
> >
> > > Yeah. After all, the "uniqueness constraint" has a theory with an
> > > excellent pedigree (IIUC linear logic, whose proof theory Clean uses
> > > here, goes back at least to the 60s, and Wadler proposed linear
> > types
> > > for IO before anybody had heard of monads).
> > >
> > Linear logic/typing does not quite capture uniqueness types since a
> > term with a unique type can always be copied to become non-unique, but
> > a linear type cannot become unrestricted.
>
> Can I write a Clean program with a function that duplicates World?
>
Clean won't let you duplicate the World. My comment on the mismatch with
linear logic is aimed more at general uniqueness type systems (e.g. recent
work by de Vries, Plasmeijer, and Abrahamson such as
https://www.cs.tcd.ie/~devriese/pub/ifl06-paper.pdf). Sorry for the
confusion.
-Jeff
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