#12944: ghc master (8.1.20161206) panics with assertion failure with devel2 flavor and -O -------------------------------------+------------------------------------- Reporter: pacak | Owner: Type: bug | Status: closed Priority: highest | Milestone: 8.2.1 Component: Compiler | Version: 8.1 (CodeGen) | Resolution: fixed | 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): Phab:D2844 Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): Also relevant (the commit message should say #12944 not #12444): {{{ revision="c48595eef2bca6d91ec0a649839f8066f269e6a4" Never apply worker/wrapper to DFuns While fixing Trac #12444 I found an occasion on which we applied worker/wrapper to a DFunId. This is bad: it destroys the magic DFunUnfolding. This patch is a minor refactoring that stops this corner case happening, and tidies up the code a bit too. }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12944#comment:14 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler