diff options
| -rw-r--r-- | tests/Properties.hs | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tests/Properties.hs b/tests/Properties.hs index e7a9854..6397b5e 100644 --- a/tests/Properties.hs +++ b/tests/Properties.hs @@ -57,7 +57,7 @@ size = M.size . stacks -- | Height of stack 'n' height :: Int -> T -> Int -height i w = length (index i w) +height i w = maybe 0 length (index i w) -- build (non-empty) StackSets with between 1 and 100 stacks -- |