beets/.github/sphinx-problem-matcher.json

{
    "problemMatcher": [
        {
            "owner": "sphinx",
            "pattern": [
                {
                    "regexp": "^Warning, treated as error:$"
                },
                {
                    "regexp": "^(.*?):(\\d+):(.*)$",
                    "file": 1,
                    "line": 2,
                    "message": 3
                }
            ]
        }
    ]
}