#10180: Lint check: Empty alternatives imply bottoming scrutinee -------------------------------------+------------------------------------- Reporter: nomeata | Owner: nomeata Type: task | Status: infoneeded Priority: normal | Milestone: Component: Compiler | Version: 7.11 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: None/Unknown | Unknown/Multiple Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- Changes (by nomeata): * status: new => infoneeded Comment: Sure enough, it trips over this {{{ *** Core Lint errors : in result of Simplifier *** libraries/base/Data/Void.hs:66:8: Warning: [in body of lambda with binder a_a2y6 :: Void] No alternatives for a case scrutinee not known to diverge for sure: a_a2y6 }}} Simon, what would you prefer: Should `exprIsBottom e` hold for all `e` where the type is a data type with no constructors, or should the lint check take that into account? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10180#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler