diff options
Diffstat (limited to 'testsuite/tests/codeGen/should_run/cgrun058.hs')
| -rw-r--r-- | testsuite/tests/codeGen/should_run/cgrun058.hs | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/testsuite/tests/codeGen/should_run/cgrun058.hs b/testsuite/tests/codeGen/should_run/cgrun058.hs new file mode 100644 index 0000000000..f0001584d1 --- /dev/null +++ b/testsuite/tests/codeGen/should_run/cgrun058.hs @@ -0,0 +1,30 @@ +-- Not really a code-gen test, but this program gave +-- incorrect results in Hugs (Hugs Trac #37), so I +-- thought I'd add it to GHC's test suite. + +module Main where + +data MInt = Zero | Succ MInt | Pred MInt deriving Show + +tn :: Int -> MInt +tn x | x<0 = Pred (tn (x+1)) +tn 0 = Zero +tn n = Succ (tn (n - 1)) + +ti :: MInt -> Int +ti Zero = 0 +ti (Succ x) = 1+(ti x) +ti (Pred x) = (ti x) -1 + +testi :: (MInt -> MInt -> MInt) -> (Int -> Int -> Int) -> Int -> Int -> Bool +testi f g x y = (ti (f (tn x) (tn y))) /= (g x y) + +myMul x y = tn ((ti x) * (ti y)) + +-- test should be empty! +test = [ (x,y,ti (myMul (tn x) (tn y)),x * y) + | x<-[-100, -99, -98, -97, -2, -1, 0, 1, 2, 97, 98, 99, 100], + y<-([-100..(-1)]++[1..100]), + testi myMul (*) x y ] + +main = print test |