GHC panic using kind application
Using GHC head at diff Visible kind application D5229 (#12045 (closed)),
bug goes away if you remove @ob
.
{-# Language RankNTypes #-}
{-# Language TypeApplications #-}
{-# Language DataKinds #-}
{-# Language PolyKinds #-}
{-# Language GADTs #-}
{-# Language TypeFamilies #-}
import Data.Kind
class Ríki (ob :: Type) where
type Hom :: ob -> ob -> Type
data
Kl_kind :: forall ob . (ob -> ob) -> ob -> Type where
Kl :: k -> Kl_kind @ob (m) k
type family
UnKl (kl :: Kl_kind m k) = (res :: k) where
UnKl (Kl a) = a
$ ghci -ignore-dot-ghci 543_bug.hs
GHCi, version 8.7.20181017: http://www.haskell.org/ghc/ :? for help
[1 of 1] Compiling Main ( 543_bug.hs, interpreted )
ghc-stage2: panic! (the 'impossible' happened)
(GHC version 8.7.20181017 for x86_64-unknown-linux):
ASSERT failed!
Type-correct unfilled coercion hole {co_a1yH}
Call stack:
CallStack (from HasCallStack):
callStackDoc, called at compiler/utils/Outputable.hs:1160:37 in ghc:Outputable
pprPanic, called at compiler/utils/Outputable.hs:1219:5 in ghc:Outputable
assertPprPanic, called at compiler/typecheck/TcHsSyn.hs:1805:99 in ghc:TcHsSyn
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
>
Trac metadata
Trac field | Value |
---|---|
Version | 8.6.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |