class Metamodel::ParametricRoleHOW
    does Metamodel::Naming
    does Metamodel::Documenting
    does Metamodel::Versioning
    does Metamodel::MethodContainer
    does Metamodel::PrivateMethodContainer
    does Metamodel::MultiMethodContainer
    does Metamodel::AttributeContainer
    does Metamodel::RoleContainer
    does Metamodel::MultipleInheritance
    does Metamodel::Stashing
    does Metamodel::TypePretense
    does Metamodel::RolePunning
    does Metamodel::ArrayType {}

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

A Metamodel::ParametricRoleHOW represents a non-instantiated, possibly parameterized, role:

(role Zape[::T{}).HOW.say;# OUTPUT: «␤» 
(role Zape {}).HOW.say# OUTPUT: «␤» 

As usual, .new_type will create a new object of this class.

my \zipi := Metamodel::ParametricRoleHOW.new_typename => "zape"group => "Zape");
say zipi.HOW# OUTPUT: «␤» 

The extra group argument will need to be used to integrate it in a parametric role group, which will need to be defined in advance.

Note: As most of the Metamodel classes, this one is here mainly for illustration purposes and it's not intended for the final user to instantiate, unless their intention is really to create a parametric role group.