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        # or other
        elsif ($name =~ /\A [^ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz] \z/x) {
            return 'main::' . $name;
        }

        elsif (defined $_[1]) {
            return $_[1] . '::' . $name;
        }
        else {
            return (caller)[0] . '::' . $name;
        }
    }

    sub qualify_to_ref ($;$) {
        if (defined $_[1]) {
            no strict qw(refs);
            return \*{ qualify $_[0], $_[1] };
        }
        else {
            no strict qw(refs);
            return \*{ qualify $_[0], (caller)[0] };
        }
    }
}

# P.714 29.2.39. flock
# in Chapter 29: Functions
# of ISBN 0-596-00027-8 Programming Perl Third Edition.

# P.863 flock
# in Chapter 27: Functions