Possible warning bug?

[astro-stan]

Describe the bug
I am running typeguard with pytest and get the following warning at the end:

======================================================================= warnings summary =======================================================================
.nox/typeguard-3-10-4/lib/python3.10/site-packages/typeguard/__init__.py:1027
  /path/to/dir/.nox/typeguard-3-10-4/lib/python3.10/site-packages/typeguard/__init__.py:1027: UserWarning: no code associated -- not typechecking click.core.<Command main>
    warn('no code associated -- not typechecking {}'.format(function_name(func)))

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
================================================================= 1 passed, 1 warning in 0.02s =================================================================

To Reproduce
Have a function like this:

import click
from . import __version__

@click.command()
@click.version_option(version=__version__)
def main() -> None:
    """Hello description."""
    click.echo("Hello, world!")

And test like this:

from my_package.cli import console

import click.testing
import pytest


@pytest.fixture
def cli_runner():
    """Return Click test runner."""
    return click.testing.CliRunner()


def test_main_succeeds(cli_runner) -> None:
    """Test main exists withtout errors."""
    result = cli_runner.invoke(console.main)
    assert result.exit_code == 0 

The above snippets should produce the warning when tested with pytest.

Expected behavior
No warning

Additional context
What leads me to believe this might be a bug is that if I change the function like so:

import click

from . import __version__


@click.command()
@click.version_option(version=__version__)
def main(): ############## Notice no "-> None:"
    """Hello description."""
    click.echo("Hello, world!")

The warning disapears.

I tried googling around for the warning but I could not find anything useful. Hopefully this is really a bug and not just me not understanding how to use this tool.

[serixscorpio]

I think this warning is a fix (#190) to highlight limitations when using click and typeguard instead of treating it as an error. #191 (comment) explains the issue in detail.

[agronholm]

Yeah, not a bug, it's just how click seems to work.