CODEWITHSUNDEEP
haskellghci
apolune
apolune

Reputation: 457

ghci show only typeclass methods

In ghci you can run the :info command to learn about the methods defined on a type class, as well as see instances of that type class.

For example, :info Eq outputs

class Eq a where
  (==) :: a -> a -> Bool
  (/=) :: a -> a -> Bool
    -- Defined in `GHC.Classes'

as well as many lines of the instances

instance (Eq k, Eq a) => Eq (Map k a)
  -- Defined in `containers-0.5.0.0:Data.Map.Base'
instance Eq a => Eq (Maybe a) -- Defined in `Data.Maybe'
...

Is there a way, in ghci, to just output the methods defined in the type class without also outputting all the instances? In other words, I would like a ghci command to output only this:

class Eq a where
  (==) :: a -> a -> Bool
  (/=) :: a -> a -> Bool
    -- Defined in `GHC.Classes'

Upvotes: 10

Views: 403

Answers (1)

luqui
luqui

Reputation: 60463

No, unfortunately. :-/

No you cannot have an answer under 30 characters.

Upvotes: 4

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