Actually, the parens aren't required at all:

$ perl -MO=Deparse
{
    package With;
    my $singleton = bless \my($x), __PACKAGE__;
    sub new { return $singleton }
    sub AUTOLOAD { return $singleton }
    sub can { return sub { return $singleton } }
}

{
    package WithOut;
    my $singleton = bless \my $x , __PACKAGE__;
    sub new { return $singleton }
    sub AUTOLOAD { return $singleton }
    sub can { return sub { return $singleton } }
}
^D
{
    package With;
    my $singleton = bless(\my($x), 'With');
    sub new {
        return $singleton;
    }
    
    sub AUTOLOAD {
        return $singleton;
    }
    
    sub can {
        return sub {
            return $singleton;
        }
        ;
    }
    ;
}
{
    package WithOut;
    my $singleton = bless(\my($x), 'WithOut');
    sub new {
        return $singleton;
    }
    
    sub AUTOLOAD {
        return $singleton;
    }
    
    sub can {
        return sub {
            return $singleton;
        }
        ;
    }
    ;
}
- syntax OK
$
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