Alessandro, many thanks. You cured that issue. Taffybar still awkward to install, but no longer being hamstrung by using the old repo.
[haskell-extra] is deprecated. Please use [haskell-web] instead, as
described here [1].
Alessandro
[1] https://wiki.archlinux.org/index.php/Haskell_package_guidelines#.5Bhaskell-web.5D