Bug Report

Not a big deal, but mypy appears to generate __match_args__ for dataclasses and NamedTuples even when running with --python-version set to 3.9:

from dataclasses import dataclass
from typing import NamedTuple

@dataclass
class One:
    bar: int

f: One
reveal_type(f.__match_args__)  # Revealed type is "Tuple[Literal['bar']]"

class Two(NamedTuple):
    baz: str

g: Two
reveal_type(g.__match_args__)  # Revealed type is "Tuple[Literal['baz']]"

Expected Behavior

Mypy should not autogenerate __match_args__ when running with --python-version set to <3.10, as pattern-matching is new in 3.10.

Your Environment

• Mypy version used: 0.950+dev.a33d2353a81d075850a487f3913720037f2473aa (compiled: no)
• Mypy command-line flags: --python-version 3.9
• Mypy configuration options from mypy.ini (and other config files): None
• Python version used: 3.10
• Operating system and version: Windows