matcher.json

{
  "problemMatcher": [
    {
      "owner": "haskell",
      "pattern": [
        {
          "regexp": "^(.+\\.hs):(\\d+):(\\d+): (\\w+):",
          "file": 1,
          "line": 2,
          "column": 3,
          "severity": 4
        },
        {
          "regexp": "^    (.*)$",
          "message": 1
        }
      ]
    }
  ]
}