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Within LTS Haskell 24.3 (ghc-9.10.2)

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Exact lookup

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

   rio	RIO.ByteString.Lazy.Partial

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

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

   rio	RIO.ByteString.Partial

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

3. head :: HasCallStack => [a] -> a

   rio	RIO.List.Partial

   Extract the first element of a list, which must be non-empty. To disable the warning about partiality put {-# OPTIONS_GHC -Wno-x-partial -Wno-unrecognised-warning-flags #-} at the top of the file. To disable it throughout a package put the same options into ghc-options section of Cabal file. To disable it in GHCi put :set -Wno-x-partial -Wno-unrecognised-warning-flags into ~/.ghci config file. See also the migration guide.

   Examples

   >>> head [1, 2, 3]
   1
   

   >>> head [1..]
   1
   

   >>> head []
   *** Exception: Prelude.head: empty list
   

4. head :: NonEmpty a -> a

   rio	RIO.NonEmpty

   Extract the first element of the stream.

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

   rio	RIO.Text.Lazy.Partial

   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 :: HasCallStack => Text -> Char

   rio	RIO.Text.Partial

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

7. head :: Vector a -> a

   rio	RIO.Vector.Boxed.Partial

   No documentation available.

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

   rio	RIO.Vector.Partial

   No documentation available.

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

   rio	RIO.Vector.Storable.Partial

   No documentation available.

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

    rio	RIO.Vector.Unboxed.Partial

    No documentation available.

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