GHC uses [https://ghc.haskell.org/trac/ghc/wiki/Commentary/Compiler/SymbolNames z-encoding], hence "zd" is "$" and "zu" is "_" . You can remove the `$w`
#13970: Segmentation fault inside threadPaused -------------------------------------+------------------------------------- Reporter: albertov | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Runtime System | Version: 8.2.1-rc3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by albertov): Replying to [comment:13 hsyl20]: prefix probably introduced by the worker/wrapper transformation, leaving you with `poly_go13` or maybe `poly_go` in the Haskell source. There's no function by those names in that module, however, I could manage to find "poly_go13" it's header (.hi) file. It's in a binary format which gives me no hints regarding where it might come from. Is there any way to inspect it in a more amicable way? Thanks! -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13970#comment:14 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler