#2799: Panic (core lint failure) with GADTs, GHC 6.10.1
-------------------------+--------------------------------------------------
Reporter: alexey_r | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.10.1 | Severity: major
Keywords: | Testcase:
Architecture: x86 | Os: Windows
-------------------------+--------------------------------------------------
The compiler panic when trying to compile
[http://www.seas.upenn.edu/~sweirich/RepLib/ RepLib 0.2].
A stripped-down example:
{{{
{-# OPTIONS -fglasgow-exts -XUndecidableInstances #-}
module RepAux (
toSpineRl
) where
data R a = R
data Nil = Nil
data a :*: l = a :*: l
data MTup r l where
MNil :: MTup ctx Nil
(:+:) :: r a -> MTup r l -> MTup r (a :*: l)
data Typed a = a ::: R a
data Spine a where
(:<>) :: Spine (a -> b) -> Typed a -> Spine b
toSpineRl :: MTup R l -> l -> (l -> a) -> Spine a
toSpineRl MNil Nil into = undefined
toSpineRl (ra :+: rs) (a :*: l) into =
(toSpineRl rs l into') :<> (a ::: ra)
where into' tl1 x1 = into (x1 :*: tl1)
}}}
Compiler panic:
{{{
F:\Programming\Libraries\Haskell\replib-bug>ghc --make RepAux
[1 of 1] Compiling RepAux ( RepAux.hs, RepAux.o )
ghc: panic! (the 'impossible' happened)
(GHC version 6.10.1 for i386-unknown-mingw32):
initC: srt_lbl
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
}}}
With -v:
{{{
F:\Programming\Libraries\Haskell\replib-bug>ghc --make RepAux -v
Glasgow Haskell Compiler, Version 6.10.1, for Haskell 98, stage 2 booted
by GHC
version 6.8.3
Using package config file: F:\proglangs\ghc\ghc-6.10.1\package.conf
hiding package base-3.0.3.0 to avoid conflict with later version
base-4.0.0.0
hiding package regex-base-0.72.0.2 to avoid conflict with later version
regex-ba
se-0.93.1
hiding package parsec-2.1.0.1 to avoid conflict with later version
parsec-3.0.0
hiding package QuickCheck-1.2.0.0 to avoid conflict with later version
QuickChec
k-2.1
hiding package QuickCheck-2.1 to avoid conflict with later version
QuickCheck-2.
1.0.1
hiding package rmonad-0.2 to avoid conflict with later version rmonad-0.3
hiding package TypeCompose-0.5.1 to avoid conflict with later version
TypeCompos
e-0.6.0
hiding package reactive-0.9.0 to avoid conflict with later version
reactive-0.9.
1
wired-in package ghc-prim mapped to ghc-prim-0.1.0.0
wired-in package integer mapped to integer-0.1.0.0
wired-in package base mapped to base-4.0.0.0
wired-in package rts mapped to rts-1.0
wired-in package haskell98 mapped to haskell98-1.0.1.0
wired-in package syb mapped to syb-0.1.0.0
wired-in package template-haskell mapped to template-haskell-2.3.0.0
wired-in package dph-seq mapped to dph-seq-0.3
wired-in package dph-par mapped to dph-par-0.3
Hsc static flags: -static
*** Chasing dependencies:
Chasing modules from: *RepAux.hs
Stable obj: []
Stable BCO: []
Ready for upsweep
[NONREC
ModSummary {
ms_hs_date = Sat Nov 22 20:43:55 Russian Standard Time 2008
ms_mod = main:RepAux,
ms_imps = []
ms_srcimps = []
}]
compile: input file RepAux.hs
Created temporary directory:
C:\Users\Alexey\AppData\Local\Temp\/ghc12212_0
*** Checking old interface for main:RepAux:
[1 of 1] Compiling RepAux ( RepAux.hs, RepAux.o )
*** Parser:
*** Renamer/typechecker:
*** Desugar:
Result size = 74
*** Simplify:
Result size = 65
Result size = 65
*** Tidy Core:
Result size = 65
*** CorePrep:
Result size = 119
*** Stg2Stg:
*** CodeGen:
*** CodeOutput:
*** Deleting temp files:
Deleting: C:\Users\Alexey\AppData\Local\Temp\/ghc12212_0/ghc12212_0.s
Warning: exception raised when deleting
C:\Users\Alexey\AppData\Local\Temp\/ghc1
2212_0/ghc12212_0.s:
DeleteFile: permission denied (The process cannot access the file because
it is
being used by another process.)
*** Deleting temp dirs:
Deleting: C:\Users\Alexey\AppData\Local\Temp\/ghc12212_0
Warning: exception raised when deleting
C:\Users\Alexey\AppData\Local\Temp\/ghc1
2212_0:
RemoveDirectory: unsatisified constraints (The directory is not empty.)
ghc: panic! (the 'impossible' happened)
(GHC version 6.10.1 for i386-unknown-mingw32):
initC: srt_lbl
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
}}}
With -dcore-lint:
{{{
F:\Programming\Libraries\Haskell\replib-bug>ghc --make RepAux -dcore-lint
[1 of 1] Compiling RepAux ( RepAux.hs, RepAux.o )
*** Core Lint Errors: in result of Desugar ***
{-# LINE 24 "RepAux.hs #-}:
[RHS of into'_ahT :: l_ahu -> a_aht -> a_ahe]
into'_agp is out of scope
*** Offending Program ***
Rec {
RepAux.toSpineRl :: forall l_ag8 a_ag9.
RepAux.MTup RepAux.R l_ag8
-> l_ag8
-> (l_ag8 -> a_ag9)
-> RepAux.Spine a_ag9
[Exported]
[]
RepAux.toSpineRl =
\ (@ l_ahd) (@ a_ahe) ->
let {
toSpineRl_ahf :: RepAux.MTup RepAux.R l_ahd
-> l_ahd
-> (l_ahd -> a_ahe)
-> RepAux.Spine a_ahe
[]
toSpineRl_ahf = RepAux.toSpineRl @ l_ahd @ a_ahe } in
\ (ds_dia :: RepAux.MTup RepAux.R l_ahd)
(ds_dib :: l_ahd)
(into_agc :: l_ahd -> a_ahe) ->
case ds_dia of wild_B1 {
RepAux.MNil @ $co$_ahn ->
letrec { } in
let {
ds_did :: RepAux.Nil
[]
ds_did =
ds_dib
`cast` (sym
(trans
(trans RepAux.Nil (sym (trans $co$_ahn (sym
RepAux.Ni
l)))) l_ahd)
:: l_ahd ~ RepAux.Nil) } in
case ds_did of wild_B1 { RepAux.Nil ->
letrec { } in GHC.Err.undefined @ (RepAux.Spine a_ahe)
};
RepAux.:+: @ a_aht @ l_ahu @ $co$_ahU ra_agf rs_agh ->
letrec {
into'_ahT :: l_ahu -> a_aht -> a_ahe
[]
into'_ahT =
into'_agp
@ a_aht
@ l_ahu
@ (trans
(trans
(a_aht RepAux.:*: l_ahu)
(sym (trans $co$_ahU (sym (a_aht RepAux.:*:
l_ahu)))))
l_ahd); } in
let {
ds_dic :: a_aht RepAux.:*: l_ahu
[]
ds_dic =
ds_dib
`cast` (sym
(trans
(trans
(a_aht RepAux.:*: l_ahu)
(sym (trans $co$_ahU (sym (a_aht RepAux.:*:
l_ahu)
))))
l_ahd)
:: l_ahd ~ a_aht RepAux.:*: l_ahu) } in
case ds_dic of wild_B1 { RepAux.:*: a_agj l_agl ->
letrec { } in
let {
into_agn :: l_ahd -> a_ahe
[]
into_agn = into_agc } in
letrec {
into'_agp :: forall a_ahH l_ahI.
(a_ahH RepAux.:*: l_ahI ~ l_ahd) =>
l_ahI -> a_ahH -> a_ahe
[]
into'_agp =
\ (@ a_ahH) (@ l_ahI) (@ co_ahK) ->
letrec {
into'_ahM :: l_ahI -> a_ahH -> a_ahe
[]
into'_ahM =
\ (tl1_ags :: l_ahI) (x1_agu :: a_ahH) ->
into_agn
((\ (sub_ai7 :: a_ahH) (sub_ai8 :: l_ahI) ->
(RepAux.:*: @ a_ahH @ l_ahI sub_ai7 sub_ai8)
`cast` (trans
(trans (a_ahH RepAux.:*: l_ahI) (sym
(sym
co_ahK))) l_ahd
:: a_ahH RepAux.:*: l_ahI ~ l_ahd))
x1_agu tl1_ags); } in
into'_ahM; } in
RepAux.:<>
@ a_ahe
@ a_aht
(RepAux.toSpineRl
@ l_ahu @ (a_aht -> a_ahe) rs_agh l_agl into'_ahT)
(RepAux.::: @ a_aht a_agj ra_agf)
}
}
end Rec }
*** End of Offense ***
<no location info>:
Compilation had errors
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2799>
GHC <http://www.haskell.org/ghc/>
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