Flaky (works once, but never again) out-of-the-box

[posita]

Steps to reproduce (ref posita/dyce@790a067):

% uname -prism
Linux 6.4.6-76060406-generic x86_64 x86_64 x86_64
% which python
python not found
% which python3
/usr/bin/python3
% python3 --version
Python 3.10.12
% git clone https://github.com/posita/dyce.git
Cloning into 'dyce'...
remote: Enumerating objects: 7093, done.
remote: Counting objects: 100% (2781/2781), done.
remote: Compressing objects: 100% (1320/1320), done.
remote: Total 7093 (delta 1481), reused 2565 (delta 1375), pack-reused 4312
Receiving objects: 100% (7093/7093), 39.06 MiB | 2.97 MiB/s, done.
Resolving deltas: 100% (4528/4528), done.
% cd dyce
% git checkout 790a067
% which code
/usr/bin/code
% code .

Once open:

1. Command Palette -> Output: Focus on Output View
2. Go to File... -> evaluation.py
3. Command Palette -> Output: Show Output Channels... -> Mypy Type Checker

Without further input, this will (eventually) lead to the following problems:

Missing return statement

[{
	"resource": "/home/<username>/<path>/dyce/dyce/evaluation.py",
	"owner": "_generated_diagnostic_collection_name_#3",
	"code": {
		"value": "empty-body",
		"target": {
			"$mid": 1,
			"path": "/en/latest/_refs.html",
			"scheme": "https",
			"authority": "mypy.readthedocs.io",
			"fragment": "code-empty-body"
		}
	},
	"severity": 8,
	"message": "Missing return statement",
	"source": "Mypy",
	"startLineNumber": 87,
	"startColumn": 5,
	"endLineNumber": 93,
	"endColumn": 12
}]

Add some text to the comment at the top of the opened evaluation.py file and save the file. Note that Mypy is run but no longer detects the error. Remove your edits and save. Mypy runs again, but still doesn't detect the error. You can only get the error back by reloading the window.

[posita]

Possible duplicate of #119 or #126.

[karthiknadig]

This is due to #88

This is an issue with dmypy itself, this occurs due to some caching issue with dmypy.

Closing in favor of this which should address it. #115