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Diffstat (limited to 'testsuite/tests/typecheck/should_run/IPRun.hs')
-rw-r--r-- | testsuite/tests/typecheck/should_run/IPRun.hs | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/testsuite/tests/typecheck/should_run/IPRun.hs b/testsuite/tests/typecheck/should_run/IPRun.hs new file mode 100644 index 0000000000..66abe6dcbe --- /dev/null +++ b/testsuite/tests/typecheck/should_run/IPRun.hs @@ -0,0 +1,26 @@ +{-# LANGUAGE ImplicitParams #-} + +module Main where + +f0 :: (?x :: Int) => () -> Int +f0 () = let ?x = 5 in ?x + -- Should always return 5 + +f1 :: (?x :: Int) => () -> Int +f1 = let ?x = 5 in \() -> ?x + -- Should always return 5 + +f2 () = let ?x = 5 in \() -> ?x + -- Inferred type: (Num a, ?x::a) => () -> () -> a + -- should always return 5 + +f3 :: () -> ((?x :: Int) => Int) +-- Deep skolemisation means that the local x=5 still wins +f3 = let ?x = 5 in \() -> ?x + +main = let ?x = 0 in + do { print (f0 ()) + ; print (f1 ()) + ; print (f2 () ()) + ; print (f3 ()) } + |