我无法为Haskell中的日期结构派生Typeable1
实例。Haskell错误:无法派生良好的实例/类型不匹配
这是我的代码:
{-# LANGUAGE StandaloneDeriving #-}
{-# LANGUAGE DeriveDataTypeable #-}
import Data.Typeable (Typeable,Typeable1)
newtype FooM m a = Foo { unFoo :: (a -> Bar m) -> Bar m }
newtype Bar m = Atom (m (Maybe (Bar m)))
type Baz m = Waldo (FooM m())
type Waldo a = a
data Qux m = Qux {
baz :: Baz m
, num :: Int
} -- deriving Typeable1 [1]
-- deriving instance Typeable1 Qux [2]
取消对第一个注释[1]给出了这样的错误:
Cannot derive well-kinded instance of form `Typeable1 (Qux ...)'
Class `Typeable1' expects an argument of kind `* -> *'
In the data type declaration for `Qux'
而且在取消[2]给出了这样的错误:
Kind mis-match
The first argument of `Typeable1' should have kind `* -> *',
but `Qux' has kind `(* -> *) -> *'
In the stand-alone deriving instance for `Typeable1 Qux'
我的问题是:如何添加Typeable
/Typeable1
的实例请问3210?