[Plugins] Access value of a StarExpr

Hi folks, I'm trying to add support for StarExpr in a plugin but I'm unable to figure out the value of the StarExpr, here's an example of the code I want to make a plugin for:

def fake_union(name: str, types: Tuple[Types, ...]) -> Union[Types]:
    ...

UserErrors = (A, B)

Response = fake_union(types=(User, *UserErrors), name="Response")

I don't know if this is possible to figure out using MyPy, so far I was only able to fetch the Var definition, but not the type

def union_hook(ctx: DynamicClassDefContext) -> None:
    types_expr = ctx.call.args[ctx.call.arg_names.index("types")]

    assert isinstance(types_expr, TupleExpr)

    for type_ in types_expr.items:
        if isinstance(type_, StarExpr):
            assert isinstance(type_.expr, NameExpr)
            name = type_.expr.name

            # how can I find the value of this expr?
            print(name)

I made a repo with a full example here: https://github.com/patrick91/mypy-star-plugin

Inizia con il repository di esempio del plugin e con gli entry point DynamicClassDefContext, TupleExpr, StarExpr e NameExpr mostrati nell’issue. Traccia come il plugin può ispezionare StarExpr per individuare UserErrors, quindi verifica che l’esempio possa accedere al valore espanso durante l’elaborazione dell’argomento types.