[GHC] #1920: Show instance for Ratio is wrong

[GHC]

#1920: Show instance for Ratio is wrong
----------------------------+-----------------------------------------------
 Reporter:  guest           |          Owner:  simonmar  
     Type:  bug             |         Status:  new       
 Priority:  normal          |      Milestone:  6.8 branch
Component:  libraries/base  |        Version:  6.6.1     
 Severity:  normal          |     Resolution:            
 Keywords:                  |     Difficulty:  Unknown   
 Testcase:                  |   Architecture:  Unknown   
       Os:  Unknown         |  
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Comment (by ross):

 If you add an infix declaration giving ::: lower precedence than minus,
 there will be no parentheses, and the second space becomes significant.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1920#comment:12>
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