[GHC] #4148: improve new recursive do syntax

[GHC]

#4148: improve new recursive do syntax
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    Reporter:  guest             |        Owner:              
        Type:  feature request   |       Status:  new         
    Priority:  normal            |    Milestone:              
   Component:  Compiler          |      Version:  6.12.3      
    Keywords:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Testcase:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Comment(by simonpj):

 The change was in fact explicitly highlighted in my email to the ghc-users
 list http://www.mail-archive.com/glasgow-haskell-
 users at haskell.org/msg17406.html.

 The difficulty I see with your suggestion is that it requires arbitrary
 lookahead to resolve the ambiguity.  And in any case, you can always use
 'mdo', right?  What's wrong with doing that?

 Simon

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4148#comment:1>
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