def METHOD_NAME():
    p = Page(
        parts=dict(
            form=Form(
                fields__foo=Field(),
            ),
            exploding_form=ExplodingForm(),
        )
    )
    p = p.bind(
        request=req(
            'post',
            **{
                '-': '',
                'foo': 'bar',
            },
        )
    )
    assert p.parts.form.fields.foo.value == 'bar'
    with pytest.raises(Exception) as e:
        # noinspection PyStatementEffect
        p.parts.exploding_form
    assert str(e.value) == 'Boom'