[GHC] #14343: bad pretty-printing of types with promoted data types

[GHC]

#14343: bad pretty-printing of types with promoted data types
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           Reporter:  lspitzner      |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.2.1
           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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 {{{
 > :set -XDataKinds
 > :set -XPolyKinds
 > data Proxy k = Proxy
 > _ :: Proxy '[ 'True ]
 error:
   Found hole: _ :: Proxy '['True]
 >             _ :: Proxy '['True]
 error:
     Invalid type signature: _ :: ...
     Should be of form <variable> :: <type>
 }}}

 Alternatively, this could be attributed to the parser/lexer doing an
 insufficient job there.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14343>
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