[Haskell-cafe] In " returnIO x = IO $ \ s -> (# s, x #)" what are the # symbols?

Jeffrey Brown jeffbrown.the at gmail.com
Tue Jul 14 00:23:01 UTC 2015


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