[Haskell-cafe] Dealing with GHC 7.10 prelude imports
brendan.g.hay at gmail.com
Sun Apr 12 19:45:22 UTC 2015
Thanks for the tips!
On 12 April 2015 at 12:37, Benno Fünfstück <benno.fuenfstueck at gmail.com>
> > I've run into a couple of cases when attempting to support multiple GHC
> versions in my libraries (7.6.3 -> 7.10) where I've repeatedly made
> mistakes due to being warned about unused imports for various modules that
> are now part of the Prelude such as Data.Monoid, Data.Foldable, etc. which
> I subsequently remove either manually or via editor automation sufficiently
> indistinguishable from magic.
> A trick is to import Prelude at the very end, like:
> import Control.Applicative
> import Data.Monoid
> import Prelude
> Since the unused import check is done from top to bottom, and you almost
> always use *something* from the Prelude, this will suppress the warning.
> There are some problems with qualified/explicit import lists if I recall
> correctly though. But it works for me most of the time.
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