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use Foo;

...
    require Foo;
    Foo->import;
    }

use MODULE qw(import list);

...
    require MODULE;
    MODULE->import(import list);
    }

use MODULE ();

BEGIN {
    require MODULE;
    }

require "lib/Foo.pm"; # no @INC searching!

sub require {
  my ($filename) = @_;
...
      return $result;
  }
}