class Auto:
  """A placeholder class to denote an automatically assigned default value."""

  def __repr__(self):
    return "<Auto>"


from dataclasses import dataclass, field, fields as dc_fields
from typing import Any, List

def apply_auto_defaults(cls):
    for f in dc_fields(cls):
        # Check if the field's default is an instance of Auto
        if isinstance(f.default, Auto):
            # Determine the appropriate default factory based on type hints
            if f.type == bool:
                default_factory = bool
            elif f.type == list:
                default_factory = list
            elif f.type == int:
                default_factory = int
            else:
                raise TypeError(f"Unsupported field type for auto-default: {f.type}")
            # Replace the placeholder with an actual dataclass field with default_factory
            setattr(cls, f.name, field(default_factory=default_factory))
    return cls


@apply_auto_defaults
@dataclass
class CarControl:
    enabled: bool = Auto()  # Auto will be replaced with field(default_factory=bool)
    speed: int = Auto()     # Auto will be replaced with field(default_factory=int)
    tags: List[str] = Auto()  # Auto will be replaced with field(default_factory=list)

# This will instantiate the dataclass with the fields set to their default types
car_control = CarControl()
print(car_control.enabled)  # Expected: False
print(car_control.speed)    # Expected: 0
print(car_control.tags)     # Expected: []