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|
{-# LANGUAGE RoleAnnotations #-}
unit p where
signature A where
data T a
unit q1 where
module A where
data T a = T a
unit q2 where
module A where
type role T nominal
data T a = T a
unit q3 where
module A where
data T a = T
unit r where
-- Subtyping test
dependency p[A=q1:A]
dependency p[A=q2:A]
dependency p[A=q3:A]
unit p2 where
signature A where
type role T representational
data T a
module M where
import Data.Coerce
import A
newtype K = K Int
f :: T K -> T Int
f = coerce
unit p3 where
-- Merge test
dependency p[A=<A>]
dependency p2[A=<A>]
module M2 where
import Data.Coerce
import A
newtype K = K Int
f :: T K -> T Int
f = coerce
|
