class Metamodel::ConcreteRoleHOW
    does Metamodel::Naming
    does Metamodel::Versioning
    does Metamodel::PrivateMethodContainer
    does Metamodel::MethodContainer
    does Metamodel::MultiMethodContainer
    does Metamodel::AttributeContainer
    does Metamodel::RoleContainer
    does Metamodel::MultipleInheritance
    does Metamodel::ArrayType
    does Metamodel::Concretization {}

Warning: this class is part of the Rakudo implementation, and is not a part of the language specification.

You can use this to build roles, in the same way that ClassHOW can be used to build classes:

my $a = Metamodel::ConcreteRoleHOW.new_type(name => "Bar");
say $a.^roles# OUTPUT: «(Mu)␤» 

The main difference with ClassHOW.new_type is that you can mix-in roles in this newly created one.

This class is Rakudo specific, and provided only for completeness. Not really intended to be used by the final user.