In Haskell, I can import a module qualified by its name or a shortcut name, like so:
import qualified Data.List as List
import qualified Data.Map
I can also import only a select set of functions from a module, or import all functions other than a select set, like so:
import Data.List (sort, intersperse)
import Data.Map hiding (findWithDefault)
Is it possible to import a specific set of functions, like in the import Data.List (sort, intersperse)
example above, but to ensure the functions are still identified in a qualified way, such as List.sort
and List.intersperse
?
Though this does not work, it is the spirit of what I am asking:
import qualified Data.List (sort, intersperse) as List
or perhaps
import qualified Data.List as List (sort, intersperse)
import qualified Data.List as List (sort, intersperse)
This is actually fine and works. The grammar of an import declaration is as follows:
5.3 Import Declarations
impdecl → import [qualified] modid [as modid] [impspec]
qualified
and as
do not prevent an import specification. This isn't a Haskell2010 addition, as it has been part of the Haskell 98 report.
On the other hand your first example
import qualified Data.List (sort, intersperse) as List
-- qualified impspec! as modid
-- ^ ^
-- +--------------------+
doesn't follow the grammar, as the impspec must be the last element in an import declaration if it's provided.