[Haskell-cafe] IO () and IO [()]

[Krzysztof Skrzętnicki]

In Python the syntax to create 1-tuple is *(element,)*. Note the ",". It's
not the most beautiful but is acceptable.


Christopher Skrzętnicki


On Tue, Mar 11, 2008 at 12:24 AM, Neil Mitchell <ndmitchell at gmail.com>
wrote:

> Hi
>
> > I understand the lack of distinction between a unit type and a 0-tuple,
> http://www.haskell.org/pipermail/
> >  since they are isomorphic.
>
> It's more we pronounce 0-tuple as unit, they are identical.
>
> >  But it is strange that there is no 1-tuple,
> >  since _|_ and the 1-tuple (_|_) would be different things entirely, no?
>
> Yes, it would be useful, but what would the syntax be? (x) already
> means something else - namely grouping. Yhc defines both Tuple1 and
> _E, both of which are the 1-tuple. I'd like it if there was a standard
> definition Box for the 1-tuple, in the base libraries.
>
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