[GHC] #11529: Show instance of Char should print literals for non-ascii printable charcters

[GHC]

#11529: Show instance of Char should print literals for non-ascii printable
charcters
-------------------------------------+-------------------------------------
        Reporter:  nushio            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      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:                    |
-------------------------------------+-------------------------------------

Comment (by nushio):

 Dear dfeuer, thank you for pointing out that the `Show Char` is specified
 in Haskell 2010. I believe the corresponding section is the following:

 https://www.haskell.org/onlinereport/haskell2010/haskellch16.html#x24-21700016.6
 {{{
 16.6 String representations

 showLitChar :: Char -> ShowS
     Convert a character to a string using only printable characters,
     using Haskell source-language escape conventions. For example:

      showLitChar '\n' s  =  "\\n" ++ s
 }}}

 where "Haskell source-language escape conventions" are defined, in turn,
 in Section 2.6
 https://www.haskell.org/onlinereport/haskell2010/haskellch2.html#x7-200002.6
 .

 Correct me if I'm wrong.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11529#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler