[GHC] #10179: Kinds missing from types in ghci
GHC
ghc-devs at haskell.org
Mon Mar 23 11:26:50 UTC 2015
#10179: Kinds missing from types in ghci
-------------------------------------+-------------------------------------
Reporter: br1 | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: GHCi | Version: 7.10.1-rc2
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
Type of failure: None/Unknown | Unknown/Multiple
Blocked By: | Test Case:
Related Tickets: | Blocking:
| Differential Revisions:
-------------------------------------+-------------------------------------
Description changed by simonpj:
Old description:
> {-# LANGUAGE TypeFamilies #-}
> {-# LANGUAGE DataKinds #-}
> {-# LANGUAGE PolyKinds #-}
>
> data family F (a:: k)
>
> foo :: F (m :: [()]) -> a
> foo = undefined
> bar :: F (m :: [[()]]) -> a
> bar = undefined
>
> according to GHCi, both foo and bar have type F m -> a but [foo, bar]
> fails
New description:
{{{
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE PolyKinds #-}
data family F (a:: k)
foo :: F (m :: [()]) -> a
foo = undefined
bar :: F (m :: [[()]]) -> a
bar = undefined
}}}
according to GHCi, both `foo` and `bar` have type `F m -> a` but `[foo,
bar]` fails
--
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10179#comment:1>
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