open my $output, '>-' or die $!;

##</code><code>##

open my $output, '>&', *STDOUT or die $!;

##</code><code>##

open my $output, '>-' or die $!;
close *STDOUT;
print {$output} "This fails with Bad file descriptor";

##</code><code>##

open my $output, '>&', *STDOUT or die $!;
close *STDOUT;
print {$output} "This prints OK\n";

##</code><code>##

my $output = *STDOUT;

##</code><code>##

close STDOUT;
print {$output}
    'Besides Bad file descriptor, this will also warn "print() on closed filehandle STDOUT"';

##</code><code>##

#!/usr/bin/perl
use strict;
use warnings;

sub original {
    open my $output, '>-' or die $!;
    $output
}

sub assign {
    my $output = *STDOUT;
    $output
}

sub dup {
    open my $output, '>&', *STDOUT or die $!;
    $output
}

sub fn {
    open my $output, '>>&=', *STDOUT->fileno or die $!;
    $output
}

use Test::More;

sub test {
    my ($open) = @_;
    my @W;
    local $SIG{__WARN__} = sub { push @W, @_ };

    my $output = $open->();
    close *STDOUT;
    my $v = print {$output} "abc\n";

    isnt $v, 1, 'fails';
    like $!, qr/Bad file descriptor/, 'Exception';
    is scalar @W, 0, 'no warnings';
    chomp, diag "($_)" for @W;
    done_testing();
}

my %dispatch = (1 => \&original,
                2 => \&assign,
                3 => \&dup,
                4 => \&fn);

my $what = shift;
my $code = $dispatch{$what} or die 'Not associated';
test($code);