#3453: Add "check" function to Control.Monad
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Reporter: JonFairbairn | Owner:
Type: proposal | Status: new
Priority: normal | Component: libraries/base
Version: 6.10.4 | Severity: normal
Keywords: | Testcase:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
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Generalisation of "guard".
check (not . isSpace) 'c' == Just 'c'
check (not . isSpace) ' ' == Nothing
See example in attached darcs patch
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3453>
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