Documentation for method add_parent assembled from the following pages:

method add_parent($obj, $parent)

Sets the base type of an enum. This can only be used if no base type was passed to .new_type.

Role: Metamodel::MultipleInheritance §

(Metamodel::MultipleInheritance) method add_parent §

method add_parent($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.