setup-dotnet/.github/csc.json

{
    "problemMatcher": [
        {
            "owner": "csc",
            "pattern": [
                {
                    "regexp": "^(?:\s+\d+\>)?([^\s].*)\((\d+|\d+,\d+|\d+,\d+,\d+,\d+)\)\s*:\s+(error|warning|info)\s+(\w{1,2}\d+)\s*:\s*(.*)(\[(.+)\/([^\/]+)\])$",
                    "file": 1,
                    "location": 2,
                    "severity": 3,
                    "code": 4,
                    "message": 5,
                    "fromPath": 7
                }
            ]
        }
    ]
}