Panic repSplitTyConApp_maybe
This definition panics!
{-# LANGUAGE TypeFamilies, TypeInType #-}
module Whoops where
import Data.Kind
type family PComp (k :: j -> Type) (x :: k) :: ()
ghc-stage2: panic! (the 'impossible' happened)
(GHC version 8.3.20170828 for x86_64-unknown-linux):
repSplitTyConApp_maybe
j_aon[sk:1]
*
*
Call stack:
CallStack (from HasCallStack):
callStackDoc, called at compiler/utils/Outputable.hs:1138:37 in ghc:Outputable
pprPanic, called at compiler/types/Type.hs:1123:5 in ghc:Type
If I make it a type synonym instead, I get a proper error as expected.
Trac metadata
Trac field | Value |
---|---|
Version | 8.2.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler (Type checker) |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | goldfire |
Operating system | |
Architecture |