#10538: Simpilifier produces empty case in core, segfaults at runtime. -------------------------------------+------------------------------------- Reporter: sopvop | Owner: bgamari Type: bug | Status: new Priority: high | Milestone: 7.10.2 Component: Compiler | Version: 7.10.2-rc1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime crash | Unknown/Multiple Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by int-e): Sorry, I meant to add a description to that file: It reproduces the same bug with a bit less code and a single file (note the strategically placed `NOINLINE`). Interestingly, the `Applicative` constraint on `reqField` is essential. I've looked a bit at the resulting traces, but I'm not sure what to look for. Here are two excerpts that I found interesting: http://lpaste.net/raw/2270642354903842816 looks like an inlining step going horribly wrong, and http://lpaste.net/6349604574378065920 shows how the odd duplicated `a1_X9lA` is introduced. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10538#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler