blob: bb31501cec4b54f4095bd2cdb26ed761a3c5f591 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
|
{-# LANGUAGE GADTs #-}
-- This one made GHC 6.6 give the very unhelpful error
-- Foo8.hs:11:10:
-- Couldn't match kind `?' against `* -> * -> *'
-- When matching the kinds of `t :: ?' and `t1 :: * -> * -> *'
-- Expected type: t1
-- Inferred type: t
-- In the pattern: Nil
module ShouldFail where
data PatchSeq p a b where
Nil :: PatchSeq p a a
U :: p a b -> PatchSeq p a b
(:-) :: PatchSeq p a b -> PatchSeq p b c -> PatchSeq p a c
-- is_normal :: PatchSeq p a b -> Bool
is_normal Nil = True
is_normal (U _) = True
is_normal (U _ :- _) = True
is_normal _ = False
|
