That's special syntax to make an unboxed tuple. See the manual section on unboxed types[1].

[1]: https://downloads.haskell.org/~ghc/7.6.3/docs/html/users_guide/primitives.html

On Mon, Jul 13, 2015 at 5:23 PM, Jeffrey Brown <jeffbrown.the@gmail.com> wrote:

That appears here: http://hackage.haskell.org/package/base-4.8.0.0/docs/src/GHC-Base.html#line-1057

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