my @symbols;
BEGIN {
    chdir 't';
    @INC = '../lib';
    require Config;
    if (($Config::Config{'extensions'} !~ /\bB\b/) ){
        print "1..0 # Skip -- Perl configured without B module\n";
        exit 0;
    }
    if ($Config::Config{'extensions'} !~ /\bFcntl\b/) {
        print "1..0 # Skip -- Perl configured without Fcntl\n";
        exit 0;
    }
    # S_IFMT is a real subroutine, and acts as control
    # SEEK_SET is a proxy constant subroutine.
    @symbols = qw(S_IFMT SEEK_SET);
}

use strict;
use warnings;
use Test::More tests => 4 * @symbols;
use B qw(svref_2object GVf_IMPORTED_CV);
use Fcntl @symbols;

# GVf_IMPORTED_CV should not be set on the original, but should be set on the
# imported GV.

foreach my $symbol (@symbols) {
    my ($ps, $ms);
    {
	no strict 'refs';
	$ps = svref_2object(\*{"Fcntl::$symbol"});
	$ms = svref_2object(\*{"::$symbol"});
    }
    isa_ok($ps, 'B::GV');
    is($ps->GvFLAGS() & GVf_IMPORTED_CV, 0,
       "GVf_IMPORTED_CV not set on original");
    isa_ok($ms, 'B::GV');
    is($ms->GvFLAGS() & GVf_IMPORTED_CV, GVf_IMPORTED_CV,
       "GVf_IMPORTED_CV set on imported GV");
}