[Haskell-cafe] ghcup and XDG support

[Sven Panne]

The ghcup-hs README contains a rather nebulous remark (
https://github.com/haskell/ghcup-hs#xdg-support):

    Note that ghcup makes some assumptions about structure of files in
XDG_BIN_HOME. So if you have other tools installing e.g. stack/cabal/ghc
into it, this will likely clash. In that case consider disabling XDG
support.

Which assumptions does it make? What will clash and when? I very much
prefer XDG-style installations, but I don't want to find out the downsides
the hard way afterwards... ;-)

Cheers,
   S.
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