[GHC] #9193: GHC panic usinig HList and Lens
#9193: GHC panic usinig HList and Lens -------------------------------------------+------------------------------- Reporter: maxigit | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Keywords: | Operating System: Architecture: x86 | Unknown/Multiple Difficulty: Easy (less than 1 hour) | Type of failure: GHCi crash Blocked By: | Test Case: Related Tickets: | Blocking: -------------------------------------------+------------------------------- This bug might have been fixed in GHC 7.8.2 but I haven't been able to test it. Some packages required to reproduce the bug are broken under 7.8.*. GHC 'panic' whilst trying to compile the following. Strangely, removing doing the last line of code 'manually' in ghci works. {{{ {-# LANGUAGE TypeFamilies, DataKinds, PolyKinds, TypeOperators #-} {-# LANGUAGE NoMonomorphismRestriction #-} module Database.Harehouse.SQLFragment where import Data.HList import Control.Lens hiding(from) x = hLens' (Label :: Label "x") }}} Note. I'm using HList-0.3.4.1 and lens-4.1.2.1. I think it wasn't working with lens 4.2 either, but since I tried to install ghc 7.8.2 I haven't be able to reinstall lens 4.2. (cabal hell). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9193 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#9193: GHC panic usinig HList and Lens -------------------------------+------------------------------------------- Reporter: maxigit | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Resolution: | Keywords: Operating System: | Architecture: x86 Unknown/Multiple | Difficulty: Easy (less than 1 hour) Type of failure: GHCi crash | Blocked By: Test Case: | Related Tickets: Blocking: | -------------------------------+------------------------------------------- Comment (by archblob): Everything works with 7.8.2. What was the panic about exactly ? Is this the complete code that caused the problem ? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9193#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#9193: GHC panic usinig HList and Lens -------------------------------+------------------------------------------- Reporter: maxigit | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Resolution: | Keywords: Operating System: | Architecture: x86 Unknown/Multiple | Difficulty: Easy (less than 1 hour) Type of failure: GHCi crash | Blocked By: Test Case: | Related Tickets: Blocking: | -------------------------------+------------------------------------------- Comment (by maxigit): There is only one line of code ... I get the following error message {{{ ghc: panic! (the 'impossible' happened) (GHC version 7.6.3 for x86_64-apple-darwin): lookupVers2 <<details unavailable>> Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} So I did I. As I said I tried with 7.8.2 but I couldn't install some dependencies which are mainly text and distributive :-( -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9193#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#9193: GHC panic usinig HList and Lens -------------------------------+------------------------------------------- Reporter: maxigit | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Resolution: fixed | Keywords: Operating System: | Architecture: x86 Unknown/Multiple | Difficulty: Easy (less than 1 hour) Type of failure: GHCi crash | Blocked By: Test Case: | Related Tickets: Blocking: | -------------------------------+------------------------------------------- Changes (by simonpj): * status: new => closed * resolution: => fixed Comment: Perhaps a dup of #8230, #8225, #7502? I'll close as fixed, but reopen if you disagree. Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9193#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#9193: GHC panic usinig HList and Lens -------------------------------+------------------------------------------- Reporter: maxigit | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Resolution: fixed | Keywords: Operating System: | Architecture: x86 Unknown/Multiple | Difficulty: Easy (less than 1 hour) Type of failure: GHCi crash | Blocked By: Test Case: | Related Tickets: Blocking: | -------------------------------+------------------------------------------- Comment (by maxigit): It's definitely a duplicate of #8225 : adding {{{ import GHC.TypeLits }}} solves the problem. This workaround should be enough until I can get 7.8.* working. Thank you very much for your really quick answers. Max -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9193#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
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