bootstrapping

[Malcolm Wallace]

As a newbie to the cabal-devel list, I don't know whether this question
has already been thought about much, and perhaps even has a really good
answer.

I notice that the Cabal darcs repo now has a Cabal.cabal file that uses
configurations.  Presumably this is self-bootstrapping.  But is it still
possible to upgrade an older version of Cabal (e.g. supplied with
ghc-6.2) to the latest version, using only the older version of Cabal
itself?

Regards,
    Malcolm