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Documentation for method add_parent assembled from the following types:
method add_parent(Metamodel::MultipleInheritance:D: $Obj, $parent, :$hides)
Adds $parent as a parent type. If $hides is set to a true value, the parent type is added as a hidden parent.
$parent must be a fully composed typed. Otherwise an exception of type X::Inheritance::NotComposed is thrown.