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## ghc-hacking.rst

      
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              August 29, 2015 14:10
                — forked from merijn/ghc-hacking.rst
            
          
Authors:
Merijn Verstraaten
Date:
2014/11/22


So You Want to Be a Super Cool GHC Hacker?

So you have a pet peeve/bug/feature request that you'd like to see added to
GHC. You made sure there was a Trac_ ticket for it, but despite your patient
waiting no one is solving your problem. Those selfish GHC hackers!


## lazyUnfoldTree3-nomfix-delayed.hs
import Data.Tree hiding (unfoldTreeM_BF, unfoldForestM_BF)

import Data.Traversable
import Prelude hiding (sequence)

import Control.Monad.Free

import Data.Functor.Identity

unfoldTreeM_BF :: Monad m => (b->m (a, [b])) -> b -> m (Tree a)
	import Data.Tree hiding (unfoldTreeM_BF, unfoldForestM_BF)

	import Data.Traversable
	import Prelude hiding (sequence)

	import Control.Monad.Free

	import Data.Functor.Identity

	unfoldTreeM_BF :: Monad m => (b->m (a, [b])) -> b -> m (Tree a)