[GHC] #7669: Empty case causes warning

GHC cvs-ghc at haskell.org
Fri Feb 15 16:09:33 CET 2013


#7669: Empty case causes warning
------------------------------------------------+---------------------------
  Reporter:  goldfire                           |          Owner:                  
      Type:  bug                                |         Status:  new             
  Priority:  normal                             |      Milestone:                  
 Component:  Compiler                           |        Version:  7.7             
Resolution:                                     |       Keywords:  EmptyCase       
        Os:  Unknown/Multiple                   |   Architecture:  Unknown/Multiple
   Failure:  Incorrect warning at compile-time  |     Difficulty:  Unknown         
  Testcase:  deSugar/should_compile/T7669       |      Blockedby:                  
  Blocking:                                     |        Related:                  
------------------------------------------------+---------------------------
Changes (by simonpj):

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


Comment:

 Very true.

 Would anyone like to look at the overlapping-pattern warnings?  It's a
 well-defined problem, restricted to a single module in GHC
 (`deSugar/Check.lhs`).  We have a bunch of tickets about it: at least
 #595, #5728, #3927, #5724, #5762, #4139, #6124.

 A lovely project awaits!

 Meanwhile I think I'll leave the code in its simplified state.

 Simon

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7669#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler



More information about the ghc-tickets mailing list