14 Sep
2010
14 Sep
'10
7:27 a.m.
On Mon, Sep 13, 2010 at 4:23 PM, Nick Bowler
... not all Num instances have an associative (+).
Indeed: $ cabal install repr # [1] ... $ ghci Prelude> :m Text.Repr Prelude Text.Repr> show (1 + 2 :: Repr Int) == show (2 + 1 :: Repr Int) False because: show (1 + 2 :: Repr Int) == "1 + 2" show (2 + 1 :: Repr Int) == "2 + 1" but note: Prelude Text.Repr> (1 + 2 :: Repr Int) == (2 + 1 :: Repr Int) True Bas [1] http://hackage.haskell.org/package/repr