[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
      Resolution:                    |             Keywords:
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 simonpj):

 Are you sure you put that in right?  With GHC 8.2.1 I get
 {{{
 Prelude> _ :: Proxy '[ 'True ]

 <interactive>:3:1: error:
     • Found hole: _ :: Proxy '['True]
     • In the expression: _ :: Proxy '[ 'True]
       In an equation for ‘it’: it = _ :: Proxy '[ 'True]
     • Relevant bindings include
         it :: Proxy '['True] (bound at <interactive>:3:1)
 }}}
 But if I miss out the space it parses `'['` as a character literal.
 {{{
 Prelude> _ :: Proxy '['True ]

 <interactive>:4:1: error:
     Invalid type signature: _ :: ...
     Should be of form <variable> :: <type>
 }}}
 Hard to avoid that.

 Make sense?  I'm inclined to say 'wont-fix'.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14343#comment:1>
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