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-rw-r--r--compiler/utils/ListSetOps.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/utils/ListSetOps.hs b/compiler/utils/ListSetOps.hs
index a8b717df00..7d6116f300 100644
--- a/compiler/utils/ListSetOps.hs
+++ b/compiler/utils/ListSetOps.hs
@@ -33,7 +33,7 @@ import qualified Data.List.NonEmpty as NE
import Data.List.NonEmpty (NonEmpty(..))
import qualified Data.Set as S
-getNth :: Outputable a => [a] -> Int -> a
+getNth :: HasCallStack => Outputable a => [a] -> Int -> a
getNth xs n = ASSERT2( xs `lengthExceeds` n, ppr n $$ ppr xs )
xs !! n