The Prelude is just what's visible in the default namespace, it's not the whole language Data.Array and // are also described in the Haskell 2010 report https

The Prelude is just what's visible in the default namespace, it's not the whole language Data.Array and // are also described in the Haskell 2010 report https://www.haskell.org/onlinereport/haskell2010/haskellch14.html https://www.haskell.org/onlinereport/haskell2010/haskellch14...