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author | partain <unknown> | 1996-01-08 20:28:12 +0000 |
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committer | partain <unknown> | 1996-01-08 20:28:12 +0000 |
commit | e7d21ee4f8ac907665a7e170c71d59e13a01da09 (patch) | |
tree | 93715bf4e6e4bbe8049e4d8d4d3fbd19158a88d6 /ghc/compiler/tests/typecheck/should_succeed/tc057.hs | |
parent | e48474bff05e6cfb506660420f025f694c870d38 (diff) | |
download | haskell-e7d21ee4f8ac907665a7e170c71d59e13a01da09.tar.gz |
[project @ 1996-01-08 20:28:12 by partain]
Initial revision
Diffstat (limited to 'ghc/compiler/tests/typecheck/should_succeed/tc057.hs')
-rw-r--r-- | ghc/compiler/tests/typecheck/should_succeed/tc057.hs | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/ghc/compiler/tests/typecheck/should_succeed/tc057.hs b/ghc/compiler/tests/typecheck/should_succeed/tc057.hs new file mode 100644 index 0000000000..cc561b95b8 --- /dev/null +++ b/ghc/compiler/tests/typecheck/should_succeed/tc057.hs @@ -0,0 +1,18 @@ +module ShouldSucceed where + +-- See also tcfail060.hs + +class Eq' a where + deq :: a -> a -> Bool + +instance Eq' Int where + deq x y = True + +instance (Eq' a) => Eq' [a] where + deq (a:as) (b:bs) = dand (f a b) (f as bs) + +dand True True = True +dand x y = False + +f :: Eq' a => a -> a -> Bool +f p q = dand (deq p q) (deq [1::Int] [2::Int]) |