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Diffstat (limited to 'testsuite/tests/typecheck/should_compile/tc097.hs')
-rw-r--r-- | testsuite/tests/typecheck/should_compile/tc097.hs | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/testsuite/tests/typecheck/should_compile/tc097.hs b/testsuite/tests/typecheck/should_compile/tc097.hs new file mode 100644 index 0000000000..a65d529dd3 --- /dev/null +++ b/testsuite/tests/typecheck/should_compile/tc097.hs @@ -0,0 +1,9 @@ +{-# LANGUAGE Rank2Types #-} +-- !!! Local universal quantification. +module ShouldSucceed where + +data Monad2 m = MkMonad2 (forall a. a -> m a) + (forall a b. m a -> (a -> m b) -> m b) + +halfListMonad :: (forall a b. [a] -> (a -> [b]) -> [b]) -> Monad2 [] +halfListMonad b = MkMonad2 (\x -> [x]) b |