We have a very nifty reduce metaoperator. Scans are a counterpart of
reduce that are very useful -- they are the (preferably lazy) list of
consecutive accumulated reductions up to the final result. But I can't
think of a convenient way of expressing scans in Perl 6.

I'm probably not thinking hard enough, so if anyone can come up with an
implementation please give it :)  Otherwise, how about we add this to
the language?


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