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  # normal mode, @ISA = qw(Gatherer::Blue)
  use StoneGatherer;

  # red mode, @ISA = qw(Gatherer::Red)
  use StoneGatherer qw(red);

  use Test::More tests => 42;

  package Item;

  sub import {
    push @{caller().'::ISA'}, __PACKAGE__;
  }