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sub new {
 
...
    if ((!defined($this)) || (!defined($tree)) || (!defined($messageNu
+m))) {
        die "invalid argument list during function call!\n";
    }

sub new {
...

    # check mandatory paramters
    assertValueIsDefined($this, $tree, $messageNum);

sub assertNamedParameters {
 
...

    return(@parameterValues);
}