[GHC] #393: functions without implementations
GHC
ghc-devs at haskell.org
Thu Jul 14 17:03:05 UTC 2016
#393: functions without implementations
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Reporter: c_maeder | Owner:
Type: feature request | Status: new
Priority: normal | Milestone: ⊥
Component: Compiler (Type | Version: None
checker) |
Resolution: | Keywords: newcomer
Operating System: Unknown/Multiple | Architecture:
| Unknown/Multiple
Type of failure: None/Unknown | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
Wiki Page: |
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Comment (by Iceland_jack):
Should also work for methods. This currently fails:
{{{#!hs
class FFunctor p where
ffmap :: (forall x. f x -> g x) -> (p f -> p g)
instance FFunctor (TList l) where
ffmap :: (forall x. f x -> g x) -> (TList l f -> TList l g)
ffmap = undefined
}}}
I would like
{{{#!hs
class FFunctor p where
ffmap :: (forall x. f x -> g x) -> (p f -> p g)
instance FFunctor (TList l) where
ffmap :: (forall x. f x -> g x) -> (TList l f -> TList l g)
}}}
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/393#comment:33>
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