On Wed, Apr 11, 2012 at 18:49, Lyndon Maydwell <maydwell@gmail.com> wrote:
Is 6 actually a limit, or is that just what is already defined? Could
a new Show instance for 7-tuples be defined?

It can be defined, it's just a pain in the butt.  GHC predefines Show for up to something like 15-tuples, I think.  

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