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eval "use Foo::Bar 5.01 qw| raz baz taz |";  # try loading v5.01
if ($@) {                  # if loading v5.01 failed
   warn "$@";              # fallback to using standard (v5.00)
   use Foo::Bar qw| baz |; # raz and taz arent valid tags here
}

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BEGIN {
   require Foo::Bar;
...
      import Foo::Bar qw( raz baz taz );
   }
}