Variables for dependent domains

[svivek]

The following test fails:

def test_dependent_variables():
    fillers = {
        "person": [
            {"name": "Jack", "pronoun": "he", "noun": "man"},
            {"name": "Jill", "pronoun": "she", "noun": "woman"},
        ],
        "location": ["New York", "Chicago"],
    }
    template = '{{name}} {{p | type("pronoun")}} {{noun}} {{p}}'

    m = MadLibTemplate(template, fillers)
    generated = m.render({"name": "Jack", "pronoun": "he", "noun": "man"})
    assert generated == "Jack he man he"

The expected behavior is that the variable p in the template should be reused, but the template creation fails with an Exception: Unknown domain for p, probably because there is so much hard coding in how variables for dependent domains are handled.