#11806: GHC does not warn for mistakenly empty case -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.3 Resolution: | Keywords: | PatternMatchWarnings Operating System: Unknown/Multiple | Architecture: Type of failure: GHC accepts | Unknown/Multiple invalid program | Test Case: Blocked By: | Blocking: Related Tickets: #10746, #7669, | Differential Rev(s): #11390 | Wiki Page: | -------------------------------------+------------------------------------- Comment (by nomeata): gkaracha, you are right that dfeuer’s working is unfortunate. He probably should have said “inhabited by a value” (in contrast to “inhabited by ⊥”). I don’t follow your argument about `silly1` and your conclusion. I would say that an empty case should issue an warning whenever the type has a constructor (and in with GADTs, if GHC cannot prove this constructor to have an impossible type). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11806#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler