Bug#933611: Any attempt to use a prompt in xmonad brings it down with a `Segmentation fault (core dumped)'.

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Package: libghc-xmonad-contrib-dev
Version: 0.14-2+b1, amd64
Severity: important

Any attempt to use a prompt in xmonad brings it down with a
`Segmentation fault (core dumped)'.

... a prompt:

  http://hackage.haskell.org/package/xmonad-contrib-0.15/docs/XMonad-Prompt.html

i write my own desktop on top of xmonad, it works quite perfectly in
stretch :), but still cannot upgrade to buster because of this... :(
... all code on my part has been upgraded off deprecated and compiles
clean with no warnings or errors.

( and linux mint inherits the same problem )