Macro + Compiler about glom HOT 4 OPEN

>>> glom({'optional': 'val'}, (Fill([T, Literal(T)]), lambda t: Fill(t), lambda t: Merge(t)))
Merge(Fill([{'optional': 'val'}, T]), init=<class 'dict'>, op=<method 'update' of 'dict' objects>)

>>> glom({'optional': 'val'}, (Fill([T, Literal(T)]), Fill, Merge))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\kurt\workspace\glom\glom\core.py", line 1764, in glom
    ret = _glom(target, spec, scope)
  File "C:\Users\kurt\workspace\glom\glom\core.py", line 1785, in _glom
    return scope[MODE](target, spec, scope)
  File "C:\Users\kurt\workspace\glom\glom\core.py", line 1794, in _glom_auto
    return _handle_tuple(target, spec, scope)
  File "C:\Users\kurt\workspace\glom\glom\core.py", line 1494, in _handle_tuple
    nxt = scope[glom](res, subspec, scope)
  File "C:\Users\kurt\workspace\glom\glom\core.py", line 1783, in _glom
    return spec.glomit(target, scope)
TypeError: glomit() missing 1 required positional argument: 'scope'

# no macro
lambda defaults: Merge(Fill([defaults, T]))
# macro
lambda defaults: glom(defaults, (Fill([T, Literal(T)]), Fill, Merge))

_BUILDER2ASSIGNER = Spec((
    Let(type=T[1]),
    T[0].items(),
    [Invoke(Assign).specs(
        lambda t: getattr(T[0], t[0]),
        Invoke(Spec).specs(T[1]))],
    Fill((
        Invoke(Fill).specs(Fill((
                Invoke(Invoke).specs(S['type']),
                Literal(T)
            ))),
        T,
        Literal(T[0])
        ))
    ))
"""
_BUILDER2ASSIGNER is a meta-spec to trasform

({'a': 'b', 'c': 'd'}, type)

to

(
    Fill( (Invoke(type), T) ),
    (
        Assign(T[0].a, T[1].b),
        Assign(T[0].c, T[1].d
    ),
    T[0]
)
"""


_DICT2LITERALS = Spec((
    T.items(),
    [Fill((T[0], Invoke(Literal).specs(T[1])))],
    dict))
"""
_DICT2LITERALS converts {key: val} to {key: Literal(val)}
"""



def django_db2tableau_conn(project_id, django_db):
    """
    convert a django database entry from settings.py into
    a tableau data-source with that connection
    """
    return glom(
        django_db,
        _BUILDER2ASSIGNER.glom((
            {
                'username': 'USER',
                'password': 'PASSWORD',
                'server_address': 'HOST',
                'server_port': 'PORT',
            },
            TSC.ConnectionItem)))

    return glom(
        {},
        _BUILDER2ASSIGNER.glom((
            _DICT2LITERALS.glom({
                'connections': [connection],
                'datasource_type': 'postgres',
                'name': django_db['NAME'],
            }),
            lambda: TSC.DatasourceItem(project_id)
            ))
        )