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    package Foo;

...
            # module for this.
        }
    }

    Foo::->this;  # OK: this
    Foo::->that;  # OK: that
    Foo::->these; # Failure: these

    package Foo::Bar;
    use base 'Foo';
...
            print "Failure: $m";
        }
    }

    Foo::Bar::->hah; # OK: hah
    Foo::Bar::->heh; # OK: heh
    Foo::Bar::->hoh; # Failure: hoh

    Foo::Bar::->this; # Failure: this
    Foo::Bar::->that; # Failure: that

    package Foo::Bar;
    use base 'Foo';
...
            }
        }
    }

    {
        package A;
...
            }
        }
    }

    A::->xism; # OK: A::xism
    B::->yism; # OK: B::yism

    package AB;
    use base 'A', 'B';

    AB::->xism; # OK: AB::xism
    AB::->yism; # Failure: AB::yism