diff options
Diffstat (limited to 'src/Data/Array/Nested/Ranked/Shape.hs')
| -rw-r--r-- | src/Data/Array/Nested/Ranked/Shape.hs | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/src/Data/Array/Nested/Ranked/Shape.hs b/src/Data/Array/Nested/Ranked/Shape.hs index 2fea8c4..6d61bd5 100644 --- a/src/Data/Array/Nested/Ranked/Shape.hs +++ b/src/Data/Array/Nested/Ranked/Shape.hs @@ -36,7 +36,7 @@ import Data.Foldable qualified as Foldable import Data.Kind (Type) import Data.Proxy import Data.Type.Equality -import GHC.Exts (Int(..), Int#, quotRemInt#) +import GHC.Exts (Int(..), Int#, quotRemInt#, build) import GHC.Generics (Generic) import GHC.IsList (IsList) import GHC.IsList qualified as IsList @@ -141,8 +141,11 @@ listrFromList topsn topl = go topsn topl {-# INLINEABLE listrToList #-} listrToList :: ListR n i -> [i] -listrToList ZR = [] -listrToList (i ::: is) = i : listrToList is +listrToList list = build (\(cons :: i -> is -> is) (nil :: is) -> + let go :: ListR n i -> is + go ZR = nil + go (i ::: is) = i `cons` go is + in go list) listrHead :: ListR (n + 1) i -> i listrHead (i ::: _) = i |