Done: https://github.com/haskell/cabal/pull/2613 :-)

--Gershom

On Mon, May 18, 2015 at 4:15 PM, Mikhail Glushenkov <the.dead.shall.rise@gmail.com> wrote:
Hi,

On 18 May 2015 at 20:22, Gershom B <gershomb@gmail.com> wrote:
> So perhaps we can just patch cabal to warn on using wget or powershell
> backends that if there are issues they should try one of the fully finished
> options, and then we can merge?

Sure, please send us a pull request.