Test that removed features can be disabled, but not enabled.

__END__
use feature "array_base";
EXPECT
OPTIONS regex
^Feature "array_base" is not supported by Perl [v0-9.]+ at - line 1.
########
no feature "array_base";
EXPECT
########
# NAME switch feature removed
use feature "switch";
EXPECT
OPTIONS regex
^Feature "switch" is not supported by Perl [v0-9.]+ at - line 1.
########
no feature "switch";
EXPECT
