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{ 
    my $sock = new IO::Socket::INET( 'localhost:12345' );
}
## Here the handle is closed.

for( 1 .. 2 ){ 
    my $sock = new IO::Socket::INET( 'localhost:12345' );
}    
## The first handle was implicitly closed during the second iteration.

...
    my $client = $svr->accept;
    async {
        ## do things with $client
    }->detach;

...
    my $client = $svr->accept;
...
        sleep 10;
        ## attempts to use $client fail
    }->detach;