NamedTuple no longer includes ellipsis for fields with default values

[ericstarr]

Bug Report

In the past, stubgen would indicate NamedTuple fields with default values using an ellipsis. Now it does not indicate which fields have default values in any way. I don't know exactly what version I used to generate my old stubs, but it was about 2 years ago.

To Reproduce

Run stubgen on a python file containing the following

from typing import NamedTuple

class Spam(NamedTuple):
    a: int
    b: int = 1

Expected Behavior

The generated stub should look like

from typing import NamedTuple

class Spam(NamedTuple):
    a: int
    b: int = ...

Actual Behavior

The generated stub looks like

from typing import NamedTuple

class Spam(NamedTuple):
    a: int
    b: int

Your Environment

• Mypy version used: 1.4.1
• Mypy command-line flags: None
• Mypy configuration options from mypy.ini (and other config files): None
• Python version used: 3.9

[sobolevn]

This was not specific for named tuples, it was a general logic for all class level assigns: https://github.com/python/mypy/blob/v0.750/mypy/stubgen.py#L981-L982

But, I agree that it makes the difference for named tuples:

from typing import NamedTuple

class A(NamedTuple):
    x: int = 1
class B(NamedTuple):
    x: int

A()
B()  # E: Missing positional argument "x" in call to "B"