[ghc-9.2.3] ghc: panic! (the 'impossible' happened) - Can't find slot
Summary
I get ghc: panic! (the 'impossible' happened)
when I compile my package.
Steps to reproduce
Minimal reproducer:
- mkdir primitive-unlifted-ghc-bug; cd primitive-unlifted-ghc-bug
- Create cabal.project
$ cat cabal.project
packages: ./
source-repository-package
type: git
location: https://github.com/haskell-primitive/primitive-unlifted.git
tag: 9b16b79318cbe294d3fdf730b8bd0e4191bf422e
- Create dot cabal file
cat primitive-unlifted-ghc-bug.cabal
cabal-version: 3.6
name: primitive-unlifted-ghc-bug
version: 0.1.0.0
author: Jan Synáček
maintainer: your.email@mmm.com
executable primitive-unlifted-ghc-bug
main-is: Main.hs
build-depends: base ^>=4.16.2.0
, primitive-unlifted == 1.0.0.0
hs-source-dirs: app
default-language: Haskell2010
- Use simple main.
$ cat app/Main.hs
module Main where
main :: IO ()
main = putStrLn "Hello, Haskell!"
- Build the package
$ cabal build -w ghc-9.2.3
...
[ 4 of 19] Compiling Data.Primitive.Unlifted.MVar.Primops ( src/Data/Primitive/Unlifted/MVar/Primops.hs, dist/build/Data/Primitive/Unlifted/MVar/Primops.o, dist/build/Data/Primitive/Unlifted/MVar/Primops.dyn_o )
ghc: panic! (the 'impossible' happened)
(GHC version 9.2.3:
findSlot
Can't find slot
[PtrUnliftedSlot]
[PtrLiftedSlot]
Call stack:
CallStack (from HasCallStack):
callStackDoc, called at compiler/GHC/Utils/Panic.hs:181:37 in ghc:GHC.Utils.Panic
pprPanic, called at compiler/GHC/Types/RepType.hs:220:9 in ghc:GHC.Types.RepType
Please report this as a GHC bug: https://www.haskell.org/ghc/reportabug
Expected behavior
No panics.
Environment
- GHC version used: 9.2.3 installed with ghcup.
- cabal-3.6.3.0
Optional:
- Operating System: Archlinux
- System Architecture: x86-64