Re: [Haskell-beginners] What does "(# #)" mean?

On 4/5/2014 10:26 AM, Brandon Allbery wrote:

On Sat, Apr 5, 2014 at 11:13 AM, John M. Dlugosz mailto:ngnr63q02@sneakemail.com> wrote:

The sources I've learned about thus far are not helping me with this one. What's "(# #)"? Haskell is search-hostile.

http://symbolhound.com :p

Hmm, I tried symbolhound, and only found pseudocode and parenthetical remarks that happened to begin with a #, or bullet points.

It's an unboxed tuple, a type that is used internally (anything named with a # is GHC internals). You can't work with it normally (you need an extension to use the MagicHash), and it has a number of restrictions since most things require a constructor but an unboxed tuple doesn't have one.

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