I don't think writing (1,) is an option for Haskell, it looks like a section (and should be one).

On Wed, Mar 12, 2008 at 9:13 PM, Bryan O'Sullivan <bos@serpentine.com> wrote:
Lennart Augustsson wrote:
> Yes, I wish Haskell had a 1-tuple.  The obvious syntax is already taken,
> but I could accept something different, like 'One a'.

Python's one-tuple syntax is (1,).  The obvious difficulty with adapting
this notation to Haskell lies in how one might write the constructor as
a section.

       <b