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Within LTS Haskell 22.24 (ghc-9.6.5)

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Exact lookup

1. head :: HasCallStack => ShortByteString -> Word8

   bytestring	Data.ByteString.Short

   O(1) Extract the first element of a ShortByteString, which must be non-empty. An exception will be thrown in the case of an empty ShortByteString. This is a partial function, consider using uncons instead.

2. head :: HasCallStack => ShortByteString -> Word8

   bytestring	Data.ByteString.Short.Internal

   O(1) Extract the first element of a ShortByteString, which must be non-empty. An exception will be thrown in the case of an empty ShortByteString. This is a partial function, consider using uncons instead.

3. head :: HasCallStack => Text -> Char

   text	Data.Text

   O(1) Returns the first character of a Text, which must be non-empty. This is a partial function, consider using uncons instead.

4. head :: HasCallStack => Stream Char -> Char

   text	Data.Text.Internal.Fusion.Common

   O(1) Returns the first character of a Stream Char, which must be non-empty. This is a partial function, consider using uncons. Properties

   head . stream = head
   

5. head :: HasCallStack => Text -> Char

   text	Data.Text.Lazy

   O(1) Returns the first character of a Text, which must be non-empty. This is a partial function, consider using uncons instead.

6. head :: Vector a -> a

   vector	Data.Vector

   O(1) First element.

7. head :: Bundle v a -> a

   vector	Data.Vector.Fusion.Bundle

   First element of the Bundle or error if empty

8. head :: Monad m => Bundle m v a -> m a

   vector	Data.Vector.Fusion.Bundle.Monadic

   First element of the Bundle or error if empty

9. head :: Vector v a => v a -> a

   vector	Data.Vector.Generic

   O(1) First element.

10. head :: Prim a => Vector a -> a

    vector	Data.Vector.Primitive

    O(1) First element.

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