#13458: Panic with unsafeCoerce and -dcore-lint -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.2.1 Component: Compiler (Type | Version: 8.1 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by dfeuer): I think the trouble here is that the (properly uninhabited) type {{{#!hs forall (r :: RuntimeRep) (a :: TYPE r) (b :: TYPE r). a -> b }}} has kind `*`, so `unsafeCoerce` happily accepts it as a target. But then when `unsafeCoerce` inlines, core lint sees `unsafeCoerce#` being used in a bogus fashion. Question: do representation-polymorphic functions need to get non-`*` kinds? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13458#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler