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| author | David Terei <davidterei@gmail.com> | 2011-07-20 11:09:03 -0700 |
|---|---|---|
| committer | David Terei <davidterei@gmail.com> | 2011-07-20 11:26:35 -0700 |
| commit | 16514f272fb42af6e9c7674a9bd6c9dce369231f (patch) | |
| tree | e4f332b45fe65e2a7a2451be5674f887b42bf199 /testsuite/tests/gadt/rw.hs | |
| parent | ebd422aed41048476aa61dd4c520d43becd78682 (diff) | |
| download | haskell-16514f272fb42af6e9c7674a9bd6c9dce369231f.tar.gz | |
Move tests from tests/ghc-regress/* to just tests/*
Diffstat (limited to 'testsuite/tests/gadt/rw.hs')
| -rw-r--r-- | testsuite/tests/gadt/rw.hs | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/testsuite/tests/gadt/rw.hs b/testsuite/tests/gadt/rw.hs new file mode 100644 index 0000000000..0d0018ac30 --- /dev/null +++ b/testsuite/tests/gadt/rw.hs @@ -0,0 +1,29 @@ +{-# LANGUAGE GADTs #-}
+
+module Main where
+
+import Data.IORef
+
+data T a where
+ Li:: Int -> T Int
+ Lb:: Bool -> T Bool
+ La:: a -> T a
+
+writeInt:: T a -> IORef a -> IO ()
+writeInt v ref = case v of
+ ~(Li x) -> writeIORef ref (1::Int)
+
+readBool:: T a -> IORef a -> IO ()
+readBool v ref = case v of
+ ~(Lb x) ->
+ readIORef ref >>= (print . not)
+
+tt::T a -> IO ()
+tt v = case v of
+ ~(Li x) -> print "OK"
+
+main = do
+ tt (La undefined)
+ ref <- newIORef undefined
+ writeInt (La undefined) ref
+ readBool (La undefined) ref
|