Check feature bundles.

__END__
# 5.9 not supported
use feature ":5.9";
EXPECT
OPTIONS regex
^Feature bundle "5.9" is not supported by Perl \S+ at [^^]*
########
# 5.9.4 not supported
use feature ":5.9.4";
EXPECT
OPTIONS regex
^Feature bundle "5.9.4" is not supported by Perl \S+ at .*
########
# 5.8.8 not supported
use feature ":5.8.8";
EXPECT
OPTIONS regex
^Feature bundle "5.8.8" is not supported by Perl \S+ at .*
