ghc panic: mergeSATInfo
ghc panic with option -O
and -fstatic-argument-transformation
.
Affected versions include 8.2.2 and HEAD (8.5.20180108)
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE PartialTypeSignatures #-}
{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module T12844 where
barWraper :: ('(r,r') ~ Head rngs, Foo rngs) => FooData rngs
barWraper = bar
bar :: (_) => FooData rngs
bar = barWraper
data FooData rngs
class Foo xs where foo :: (Head xs ~ '(r,r')) => FooData xs
type family Head (xs :: [k]) where Head (x ': xs) = x
Log:
ghc: panic! (the 'impossible' happened)
(GHC version 8.5.20180108 for x86_64-unknown-linux):
mergeSATInfo
Left:STSTSTSTSTSVSV, Right:STSTSTSTSTSVSC
Call stack:
CallStack (from HasCallStack):
callStackDoc, called at compiler/utils/Outputable.hs:1150:37 in ghc:Outputable
pprPanic, called at compiler/simplCore/SAT.hs:152:20 in ghc:SAT
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
Trac metadata
Trac field | Value |
---|---|
Version | 8.2.2 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |