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 |