panic when building repa-fftw

Sorry, if I reported it wrongly. It is my first bug. -- While building package repa-fftw-3.2.3.2 using:

/home/kosh/.stack/setup-exe-cache/x86_64-linux-nix/setup-Simple-Cabal-1.24.0.0-ghc-8.0.1 --builddir=.stack-work/dist/x86_64-linux-nix/Cabal-1.24.0.0 build --ghc-options " -ddump-hi -ddump-to-file"

Process exited with code: ExitFailure 1

Logs have been written to: /home/kosh/haskell/spRepa/.stack-work/logs/repa-fftw-3.2.3.2.log

Configuring repa-fftw-3.2.3.2...

Building repa-fftw-3.2.3.2...

Preprocessing library repa-fftw-3.2.3.2...

[1 of 1] Compiling Data.Array.Repa.FFTW ( Data/Array/Repa/FFTW.hs, .stack-work/dist/x86_64-linux-nix/Cabal-1.24.0.0/build/Data/Array/Repa/FFTW.o )

ghc: panic! (the 'impossible' happened)

(GHC version 8.0.1 for x86_64-unknown-linux):

filterImports/combine

(Array,

Array{Array, AByteString, ACursored, ADelayed, AForeignPtr, AInterleave, ASmall, APart, AUnboxed, AUndefined, AVector, cursoredExtent, loadCursor, makeCursor, shiftCursor},

Nothing)

(Array,

Source{Source, Array, deepSeqArray, extent, index, linearIndex, unsafeIndex, unsafeLinearIndex},

Nothing)

Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug

Trac metadata

Trac field	Value
Version	8.0.1
Type	Bug
TypeOfFailure	BuildingGhcFailed
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture

changed weight to 5

added Tbug Trac import ghc build failure labels

Attached file spRepa.cabal (download).

cabal file

Attached file stack.yaml (download).

stack file

Trac metadata

Trac field	Value
TypeOfFailure	BuildingGhcFailed → CompileTimeCrash

Seems likely to be #11959 (closed) without looking at the example at all. Does that look sensible to you?

Also, reproduction instructions which use stack are not useful as it is not easy to use a custom build of GHC with stack.

Not really. I am very new to haskell. If you will advice me what to do, I would like to do it. I can attach my source code, which is like 50 lines.

Attached file Main.hs ($1230).

I'm looking a bit more closely. Sorry for the red herring.

Here is a minimal reproduction. It is two files.

1. M.hs

{-# LANGUAGE TypeFamilies #-}
module M
        ( -- * Abstract array representation
         Array (..)
        , Source(..)

        )
where

class Source r where
 data Array r

data C

instance Source C where
 data Array C
        = ACursored { cursoredExtent :: Int }

1. Test.hs

module Test where

import M (Array)

Reproduce with ghc Test.hs.

Error being

ghc: panic! (the 'impossible' happened)
  (GHC version 8.0.1 for x86_64-apple-darwin):
	filterImports/combine
  (Array, Array{Array, ACursored, cursoredExtent}, Nothing)
  (Array, Source{Source, Array}, Nothing)

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

Thanks for the report koshmar! Hopefully Simon will know a workaround.

closed

Thanks. This is actually a dup of #12127 (closed), which is fixed and merged, so it'll be in the 8.0.2 release.

Simon

Trac metadata

Trac field	Value
Resolution	Unresolved → ResolvedFixed

added Pnormal label