class methods with associated equality constraints panic
The following file causes a panic ("getEqPredTys"):
{-# LANGUAGE ConstraintKinds, TypeFamilies #-}
import GHC.Exts
class Pair p where
type Ctxt p a :: Constraint
l :: Ctxt p a => p a -> a
data Unit a = Unit
instance Pair Unit where
type Ctxt Unit a = a ~ ()
l _ = ()
Trac metadata
Trac field | Value |
---|---|
Version | 7.6.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |