[GHC] #3446: Library enhancement request: Data.Maybe.justIf

[GHC]

#3446: Library enhancement request: Data.Maybe.justIf
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  Reporter:  nomeata         |          Owner:                  
      Type:  proposal        |         Status:  new             
  Priority:  normal          |      Milestone:  Not GHC         
 Component:  libraries/base  |        Version:  6.10.4          
Resolution:                  |       Keywords:                  
Difficulty:  Unknown         |             Os:  Unknown/Multiple
  Testcase:                  |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown    |  
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Comment(by uzytkownik):

 Wouldn't it be better to have in Control.Applicative:

 {{{
 guardBy :: Alternative f => a -> Bool -> f a
 guardBy _ False = empty
 guardBy v True  = pure v

 guardBy' :: Alternative f => a -> (a -> Bool) -> f a
 guardBy' v f = guardBy v (f v)
 }}}

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3446#comment:6>
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