How to check Haskell infix operator precedence

Question

I can see the type of an infix operator in GHCi with :t like so:

>:t (.)
(.) :: (b -> c) -> (a -> b) -> a -> c

How can i see the operator precedence in GHCi? is that possible?

Also, bonus question, is there a way to see the source of these prelude functions through ghci?

score 33 · Accepted Answer · answered Sep 02 '12 at 19:06

33

:i (:info).

[Prelude]
> :i (+)
class Num a where
  (+) :: a -> a -> a
  ...
        -- Defined in `GHC.Num'
infixl 6 +

answered Sep 02 '12 at 19:06

Cat Plus Plus

Thanks -- anyway to see the source from GHCI, or is that a pipedream? – Adam Gordon Bell Sep 02 '12 at 19:14
@Adam To see the source, you can't use ghci (yet). The haddocks should link to syntax-coloured sources. – Daniel Fischer Sep 02 '12 at 19:18
Note that you can use hoogle (http://www.haskell.org/hoogle/) or hayoo (http://holumbus.fh-wedel.de/hayoo/hayoo.html) to easily access the haddock documentation of a function. – Jan Christiansen Sep 02 '12 at 19:32

1 Answers1