Core Lint error, from visible kind applications
{-# Language RankNTypes #-}
{-# Language GADTs #-}
{-# Language TypeApplications #-}
{-# Language PolyKinds #-}
{-# Options_GHC -dcore-lint #-}
import Data.Kind
data A :: forall k. Type where
MkA :: A @k
this cute bug crashes under the visible kind application diff, produces:
$ ghci -ignore-dot-ghci 545_bug.hs
GHCi, version 8.7.20181017: http://www.haskell.org/ghc/ :? for help
[1 of 1] Compiling Main ( 545_bug.hs, interpreted )
*** Core Lint errors : in result of Tidy Core ***
<no location info>: warning:
In the type ‘forall (k :: k_a1xN[sk:1]) k. A’
@ k_a1xN[sk:1] is out of scope
*** Offending Program ***
$WMkA [InlPrag=INLINE[2]] :: forall (k :: k_a1xN[sk:1]) k. A
[GblId[DataConWrapper],
Caf=NoCafRefs,
Unf=Unf{Src=InlineStable, TopLvl=True, Value=True, ConLike=True,
WorkFree=True, Expandable=True,
Guidance=ALWAYS_IF(arity=0,unsat_ok=True,boring_ok=True)
Tmpl= \ (@ (k_a1y5 :: k_a1xN[sk:1])) (@ k_X1xP) ->
MkA @ k_X1xP @ k_a1y5}]
$WMkA
= \ (@ (k_a1y5 :: k_a1xN[sk:1])) (@ k_X1xP) ->
MkA @ k_X1xP @ k_a1y5
$trModule1_r1zb :: Addr#
[GblId, Caf=NoCafRefs, Unf=OtherCon []]
$trModule1_r1zb = "main"#
$trModule2_r1zu :: TrName
[GblId, Caf=NoCafRefs, Unf=OtherCon []]
$trModule2_r1zu = TrNameS $trModule1_r1zb
$trModule3_r1zv :: Addr#
[GblId, Caf=NoCafRefs, Unf=OtherCon []]
$trModule3_r1zv = "Main"#
$trModule4_r1zw :: TrName
[GblId, Caf=NoCafRefs, Unf=OtherCon []]
$trModule4_r1zw = TrNameS $trModule3_r1zv
$trModule :: Module
[GblId, Caf=NoCafRefs, Unf=OtherCon []]
$trModule = Module $trModule2_r1zu $trModule4_r1zw
$krep_r1zx :: KindRep
[GblId, Caf=NoCafRefs, Unf=OtherCon []]
$krep_r1zx = KindRepVar 1#
$krep1_r1zy :: KindRep
[GblId, Caf=NoCafRefs, Unf=OtherCon []]
$krep1_r1zy = KindRepVar 0#
$tcA1_r1zz :: Addr#
[GblId, Caf=NoCafRefs, Unf=OtherCon []]
$tcA1_r1zz = "A"#
$tcA2_r1zA :: TrName
[GblId, Caf=NoCafRefs, Unf=OtherCon []]
$tcA2_r1zA = TrNameS $tcA1_r1zz
$tcA :: TyCon
[GblId, Unf=OtherCon []]
$tcA
= TyCon
16201120719427956884##
13080046616073797921##
$trModule
$tcA2_r1zA
2#
krep$*
$krep2_r1zB :: [KindRep]
[GblId, Caf=NoCafRefs, Unf=OtherCon []]
$krep2_r1zB = : @ KindRep $krep1_r1zy ([] @ KindRep)
$krep3_r1zC :: [KindRep]
[GblId, Caf=NoCafRefs, Unf=OtherCon []]
$krep3_r1zC = : @ KindRep $krep_r1zx $krep2_r1zB
$krep4_r1zD :: KindRep
[GblId, Unf=OtherCon []]
$krep4_r1zD = KindRepTyConApp $tcA $krep3_r1zC
$tc'MkA1_r1zE :: Addr#
[GblId, Caf=NoCafRefs, Unf=OtherCon []]
$tc'MkA1_r1zE = "'MkA"#
$tc'MkA2_r1zF :: TrName
[GblId, Caf=NoCafRefs, Unf=OtherCon []]
$tc'MkA2_r1zF = TrNameS $tc'MkA1_r1zE
$tc'MkA :: TyCon
[GblId, Unf=OtherCon []]
$tc'MkA
= TyCon
1695572187443655535##
16213897990811765752##
$trModule
$tc'MkA2_r1zF
2#
$krep4_r1zD
*** End of Offense ***
<no location info>: error:
Compilation had errors
*** Exception: ExitFailure 1
Another example that fails
data
Kl_kind :: forall (m :: k -> Type). Type where
Kl :: k -> Kl_kind @(m :: k -> Type)