[GHC] #12560: ‘:info TYPE’ mentions any instance that includes ‘Type’

[GHC]

#12560: ‘:info TYPE’ mentions any instance that includes ‘Type’
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           Reporter:  Iceland_jack   |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Unexpected behaviour

 {{{
 $ ghci -ignore-dot-ghci
 GHCi, version 8.0.1: http://www.haskell.org/ghc/  :? for help
 Prelude> import GHC.Types
 Prelude GHC.Types> :i TYPE
 type role TYPE nominal
 data TYPE (t1 :: RuntimeRep)
         -- Defined in ‘GHC.Prim’
 }}}

 Importing `Data.Proxy` gives me some of its instances,

 {{{
 Prelude GHC.Types> import Data.Proxy
 Prelude GHC.Types Data.Proxy> :i TYPE
 type role TYPE nominal
 data TYPE (t1 :: RuntimeRep)
         -- Defined in ‘GHC.Prim’
 instance Monad Proxy -- Defined in ‘Data.Proxy’
 instance Functor Proxy -- Defined in ‘Data.Proxy’
 instance Applicative Proxy -- Defined in ‘Data.Proxy’
 instance Foldable Proxy -- Defined in ‘Data.Foldable’
 instance Traversable Proxy -- Defined in ‘Data.Traversable’
 Prelude GHC.Types Data.Proxy>
 }}}

 because they mention `*`

 {{{
 Prelude GHC.Types Data.Proxy> :set -fprint-explicit-kinds
 Prelude GHC.Types Data.Proxy> :i TYPE
 type role TYPE nominal
 data TYPE (t1 :: RuntimeRep)
         -- Defined in ‘GHC.Prim’
 instance Monad (Proxy *) -- Defined in ‘Data.Proxy’
 instance Functor (Proxy *) -- Defined in ‘Data.Proxy’
 instance Applicative (Proxy *) -- Defined in ‘Data.Proxy’
 instance Foldable (Proxy *) -- Defined in ‘Data.Foldable’
 instance Traversable (Proxy *) -- Defined in ‘Data.Traversable’
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12560>
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