[GHC] #1979: Add variants of tails and inits not returning empty lists

[GHC]

#1979: Add variants of tails and inits not returning empty lists
-------------------------------+--------------------------------------------
    Reporter:  mux             |       Owner:         
        Type:  proposal        |      Status:  new    
    Priority:  normal          |   Milestone:  6.8.3  
   Component:  libraries/base  |     Version:  6.8.1  
    Severity:  normal          |    Keywords:         
  Difficulty:  Unknown         |    Testcase:         
Architecture:  Unknown         |          Os:  Unknown
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 This patch adds the tails1 and inits1 function, that behave like their
 counterpart except that they won't return an empty list.  I've needed them
 several times already, so it seems to me they would be useful to have in
 base.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1979>
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