role Bar {
  COMPOSE {
    print "Bar() was composed into: ";
    print $_; # => What your being composed into
    print " and {$_} was defined: ";
    say $_.defined; # How to tell if its a class instance or an object instance
  }
}

class Foo does Bar {
  INHERIT {
    print "Foo() was inherited into child: ";
    print $_; # => What your being inherited into
  }
}

class Child is Foo {
}

class GrandChild is Child {
}

my $i = 123;

$i does Bar;

=begin pod
expected output:

Bar() was composed into: Foo() and Foo() was defined: 0
Foo() was inherited into child: Child()
Foo() was inherited into child: GrandChild()
Bar() was composed into: 123 and 123 was defined: 1

=end pod