[GHC] #4905: New flag to disable warning on incomplete pattern matches in lambdas

[GHC]

#4905: New flag to disable warning on incomplete pattern matches in lambdas
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  Reporter:  batterseapower   |          Owner:                  
      Type:  feature request  |         Status:  closed          
  Priority:  normal           |      Milestone:                  
 Component:  Compiler         |        Version:  7.0.1           
Resolution:  fixed            |       Keywords:                  
  Testcase:                   |      Blockedby:                  
Difficulty:                   |             Os:  Unknown/Multiple
  Blocking:                   |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown     |  
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Changes (by simonpj):

  * status:  new => closed
  * resolution:  => fixed


Comment:

 Implemented by
 {{{
 Thu Jan 27 13:13:04 GMT 2011  simonpj at microsoft.com
   * Refine incomplete-pattern checks (Trac #4905)

   The changes are:

   * New flag -fwarn-incomplete-uni-patterns, which checks for
     incomplete patterns in (a) lambdas, (b) pattern bindings

   * New flag is not implied by -W or -Wall (too noisy; and many
     libraries use incomplete pattern bindings)

   * Actually do the incomplete-pattern check for pattern bindings
     (previously simply omitted)

   * Documentation for new flag

     M ./compiler/deSugar/DsGRHSs.lhs -3 +3
     M ./compiler/deSugar/Match.lhs -32 +38
     M ./compiler/hsSyn/HsExpr.lhs -3 +6
     M ./compiler/main/DynFlags.hs -6 +10
     M ./docs/users_guide/flags.xml +7
     M ./docs/users_guide/using.xml -10 +25

   * Fix formatting glitch in documentation

     M ./docs/users_guide/using.xml -1 +2
 }}}
 So now `-fwarn-incomplete-patterns` doesn't warn about lambdas, but
 `-fwarn-incomplete-uni-patterns` warns about both lambdas and pattern
 bindings.

 Simon

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4905#comment:2>
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