[GHC] #11342: Character kind

[GHC]

#11342: Character kind
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           Reporter:  alexvieth      |             Owner:  alexvieth
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  7.10.3
           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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 We know and love the Symbol kind, but as far as I know it's not possible
 to analyse a Symbol type, as we would a String term. It would be nice to
 have a Character kind and some related type families:

 {{{#!hs
 data Character
 -- Pattern match a Symbol. 'Nothing when empty, 'Just '(head, tail)
 -- otherwise.
 type family UnconsSymbol (s :: Symbol) :: Maybe (Character, Symbol)
 -- Put a Character at the head of a Symbol.
 type family ConsSymbol (c :: Character) (s :: Symbol) :: Symbol
 -- Work with Characters. Ideally we'd have counterparts for every
 -- function on Data.Char.
 type family ToUpper (c :: Character) :: Character
 type family IsAlpha (c :: Character) :: Bool
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11342>
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