[GHC] #1555: Reverse do notation: lexer bug?

[GHC]

#1555: Reverse do notation: lexer bug?
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 Reporter:  dons               |          Owner:             
     Type:  feature request    |         Status:  reopened   
 Priority:  normal             |      Milestone:             
Component:  Compiler (Parser)  |        Version:  6.6.1      
 Severity:  normal             |     Resolution:             
 Keywords:                     |     Difficulty:  Easy (1 hr)
 Testcase:                     |   Architecture:  Unknown    
       Os:  Unknown            |  
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Comment (by igloo):

 Note that similar syntax is now used by the view patterns extension, which
 might add confusion.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1555#comment:5>
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