The other two work arounds are
1. Explicit import lists for the stuff you need.
2. Explicit export list for your module (which you do), and internally
use non-overloaded identifiers.
module AnnoyinglyLongModuleName
( AnnoyinglyLongModuleName.length
, AnnoyinglyLongModuleName.null
) where
length = length'
null = null'
length' :: a -> Int
length' _ = 0
null' :: a -> Bool
null' = (== 0) . length'
On 29.09.2014 10:48, Herbert Valerio Riedel wrote:
On 2014-09-29 at 10:43:28 +0200, Andreas Abel wrote:
Indeed, being able to introduce a short name for the current module,
or having a fixed short name like 'This' or 'Self' would be neat.
The standard workaround for your example would be
import Prelude hiding (length,null)
That won't work though, because what I failed to mention is that I
needed this (while avoiding CPP) to cope with external modules growing
their exports lists, such as Data.Foldable starting to export 'length'
and 'null' in base-4.8.0.0
Moreover, hiding a non-existent symbol is a warning in recent GHC's but
a hard error in older GHCs, so that's not an option either if you want
to avoid CPP, support GHCs back to 7.0, and be -Werror-clean.
More generally, 'hiding'-imports aren't robust in terms of
forward-compatibility.
Did you try a .hs-boot file with your self-import trick?
Not yet
--
Andreas Abel <>< Du bist der geliebte Mensch.
Department of Computer Science and Engineering
Chalmers and Gothenburg University, Sweden
[email protected]
http://www2.tcs.ifi.lmu.de/~abel/
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