#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 simonpj): Indeed. Another way to see it is via my examples in comment:1. It is extremely unexpected that removing one alternative from an exhaustive Boolean `case` would yield a warning, but removing both alternatives does not. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11806#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler