1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
{-# LANGUAGE ExplicitForAll #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE TypeInType #-}
{-# LANGUAGE TypeApplications #-}
module ExplicitForAllRules1 where
import Data.Proxy
import Data.Kind
-- From Proposal 0007 (w/ fix to "example")
{-# RULES
"example" forall a b. forall. map @a @b f = f
"example2" forall a. forall (x :: a). id x = x
#-}
{-# NOINLINE f #-}
f :: a -> b
f = undefined
-- More tests
{-# RULES
"example3" forall (a :: Type -> Type) (b :: a Int) c. forall x y. g @(Proxy b) @(Proxy c) x y = ()
"example4" forall (a :: Bool) (b :: Proxy a). forall x. g @(Proxy b) @() x = id @()
"example5" forall (a :: Type). forall. h @a = id @a
"example5" forall k (c :: k). forall (x :: Proxy c). id @(Proxy c) x = x
#-}
{-# NOINLINE g #-}
g :: a -> b -> ()
g _ _ = ()
{-# NOINLINE h #-}
h :: a -> a
h x = x
-- Should NOT have a parse error :(
{-# RULES "example6" forall a forall. g a forall = () #-}
-- Should generate a warning
{-# RULES "example7" forall a b. forall (x :: a). id x = x #-}
|
