Panic with DeriveAnyClass
With the code
{-# LANGUAGE DefaultSignatures, DeriveAnyClass #-}
class Eq1 f where
(==#) :: Eq a => f a -> f a -> Bool
default (==#) :: Eq (f a) => f a -> f a -> Bool
(==#) = (==)
data Foo a = Foo (Either a a)
deriving (Eq, Eq1)GHC 8.0.1 and 7.10.3 both panic:
ghc: panic! (the 'impossible' happened)
(GHC version 8.0.1 for x86_64-apple-darwin):
in other argument
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
Trac metadata
| Trac field | Value |
|---|---|
| Version | 8.0.1 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |