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author | David Terei <davidterei@gmail.com> | 2011-07-20 11:09:03 -0700 |
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committer | David Terei <davidterei@gmail.com> | 2011-07-20 11:26:35 -0700 |
commit | 16514f272fb42af6e9c7674a9bd6c9dce369231f (patch) | |
tree | e4f332b45fe65e2a7a2451be5674f887b42bf199 /testsuite/tests/rebindable/T303.hs | |
parent | ebd422aed41048476aa61dd4c520d43becd78682 (diff) | |
download | haskell-16514f272fb42af6e9c7674a9bd6c9dce369231f.tar.gz |
Move tests from tests/ghc-regress/* to just tests/*
Diffstat (limited to 'testsuite/tests/rebindable/T303.hs')
-rw-r--r-- | testsuite/tests/rebindable/T303.hs | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/testsuite/tests/rebindable/T303.hs b/testsuite/tests/rebindable/T303.hs new file mode 100644 index 0000000000..418a695e8d --- /dev/null +++ b/testsuite/tests/rebindable/T303.hs @@ -0,0 +1,30 @@ +{-# LANGUAGE RebindableSyntax #-}
+
+-- Trac #303
+
+module T where
+import qualified Prelude as P
+
+class IxMonad m where
+ return :: a -> m i i a
+ (>>=) :: m i j a -> (a -> m j k b) -> m i k b
+ (>>) :: m i j a -> m j k b -> m i k b
+ m >> n = m >>= \_ -> n
+
+ fail :: P.String -> m i j a
+ fail s = P.error s
+
+data T a b c = T
+instance IxMonad T where
+ return _ = T
+ m >>= f = T
+ fail _ = T
+
+testM :: T (a,b) b a
+testM = T
+
+test1 = testM >>= \x -> return x
+
+test2 = do
+ x <- testM
+ return x
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