diff options
Diffstat (limited to 'testsuite/tests/mdo/should_compile/mdo004.hs')
| -rw-r--r-- | testsuite/tests/mdo/should_compile/mdo004.hs | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/testsuite/tests/mdo/should_compile/mdo004.hs b/testsuite/tests/mdo/should_compile/mdo004.hs new file mode 100644 index 0000000000..544ee6cc66 --- /dev/null +++ b/testsuite/tests/mdo/should_compile/mdo004.hs @@ -0,0 +1,17 @@ +{-# OPTIONS -XRecursiveDo #-} + +-- test let bindings, polymorphism is ok provided they are not +-- isolated in a recursive segment +-- NB. this is not what Hugs does! + +module Main (main) where + +import Control.Monad.Fix + +t :: IO (Int, Int) +t = mdo let l [] = 0 + l (x:xs) = 1 + l xs + return (l "1", l [1,2,3]) + +main :: IO () +main = t >>= print |