console.ts:137 [Extension Host] Failed to build Ignore fix for diagnostics. Please report the information below in the Dart-Code/Dart-Code repo on GitHub.
T @ console.ts:137
$logExtensionHostMessage @ mainThreadConsole.ts:39
N @ rpcProtocol.ts:455
M @ rpcProtocol.ts:440
H @ rpcProtocol.ts:370
G @ rpcProtocol.ts:296
(anonymous) @ rpcProtocol.ts:161
invoke @ event.ts:718
deliver @ event.ts:926
fire @ event.ts:887
fire @ ipc.net.ts:671
ne.onmessage @ localProcessExtensionHost.ts:615
console.ts:137 [Extension Host] Original diagnostics:
[
  {
    "severity": "Error",
    "message": "Classes can only extend other classes.\nTry specifying a different superclass, or removing the extends clause.",
    "range": [
      {
        "line": 88,
        "character": 44
      },
      {
        "line": 88,
        "character": 55
      }
    ],
    "source": "dart",
    "code": {
      "value": "extends_non_class",
      "target": {
        "$mid": 1,
        "fsPath": "/diagnostics/extends_non_class",
        "path": "/diagnostics/extends_non_class",
        "scheme": "https",
        "authority": "dart.dev"
      }
    }
  },
  {
    "severity": "Information",
    "message": "Missing a newline at the end of the file.\nTry adding a newline at the end of the file.",
    "range": [
      {
        "line": 89,
        "character": 1
      },
      {
        "line": 89,
        "character": 2
      }
    ],
    "source": "dart",
    "code": {
      "value": "eol_at_end_of_file",
      "target": {
        "$mid": 1,
        "fsPath": "/linter/lints/eol_at_end_of_file.html",
        "path": "/linter/lints/eol_at_end_of_file.html",
        "scheme": "https",
        "authority": "dart-lang.github.io"
      }
    }
  },
  {
    "severity": "Warning",
    "message": "Avoid using dynamic type.\n",
    "range": [
      {
        "line": 88,
        "character": 36
      },
      {
        "line": 88,
        "character": 55
      }
    ],
    "source": "dart",
    "code": {
      "value": "avoid-dynamic",
      "target": {
        "$mid": 1,
        "fsPath": "/docs/individuals/rules/common/avoid-dynamic",
        "path": "/docs/individuals/rules/common/avoid-dynamic",
        "scheme": "https",
        "authority": "dcm.dev"
      }
    }
  },
  {
    "severity": "Warning",
    "message": "File name does not match with first class name.\n",
    "range": [
      {
        "line": 88,
        "character": 6
      },
      {
        "line": 88,
        "character": 35
      }
    ],
    "source": "dart",
    "code": {
      "value": "prefer-match-file-name",
      "target": {
        "$mid": 1,
        "fsPath": "/docs/individuals/rules/common/prefer-match-file-name",
        "path": "/docs/individuals/rules/common/prefer-match-file-name",
        "scheme": "https",
        "authority": "dcm.dev"
      }
    }
  }
]

Document has 90 lines
T @ console.ts:137
$logExtensionHostMessage @ mainThreadConsole.ts:39
N @ rpcProtocol.ts:455
M @ rpcProtocol.ts:440
H @ rpcProtocol.ts:370
G @ rpcProtocol.ts:296
(anonymous) @ rpcProtocol.ts:161
invoke @ event.ts:718
deliver @ event.ts:926
fire @ event.ts:887
fire @ ipc.net.ts:671
ne.onmessage @ localProcessExtensionHost.ts:615
console.ts:137 [Extension Host] After CodeAction request diagnostics:
[
  {
    "severity": "Error",
    "message": "Classes can only extend other classes.\nTry specifying a different superclass, or removing the extends clause.",
    "range": [
      {
        "line": 88,
        "character": 44
      },
      {
        "line": 88,
        "character": 55
      }
    ],
    "source": "dart",
    "code": {
      "value": "extends_non_class",
      "target": {
        "$mid": 1,
        "fsPath": "/diagnostics/extends_non_class",
        "path": "/diagnostics/extends_non_class",
        "scheme": "https",
        "authority": "dart.dev"
      }
    }
  },
  {
    "severity": "Information",
    "message": "Missing a newline at the end of the file.\nTry adding a newline at the end of the file.",
    "range": [
      {
        "line": 89,
        "character": 1
      },
      {
        "line": 89,
        "character": 2
      }
    ],
    "source": "dart",
    "code": {
      "value": "eol_at_end_of_file",
      "target": {
        "$mid": 1,
        "fsPath": "/linter/lints/eol_at_end_of_file.html",
        "path": "/linter/lints/eol_at_end_of_file.html",
        "scheme": "https",
        "authority": "dart-lang.github.io"
      }
    }
  },
  {
    "severity": "Warning",
    "message": "Avoid using dynamic type.\n",
    "range": [
      {
        "line": 88,
        "character": 36
      },
      {
        "line": 88,
        "character": 55
      }
    ],
    "source": "dart",
    "code": {
      "value": "avoid-dynamic",
      "target": {
        "$mid": 1,
        "fsPath": "/docs/individuals/rules/common/avoid-dynamic",
        "path": "/docs/individuals/rules/common/avoid-dynamic",
        "scheme": "https",
        "authority": "dcm.dev"
      }
    }
  },
  {
    "severity": "Warning",
    "message": "File name does not match with first class name.\n",
    "range": [
      {
        "line": 88,
        "character": 6
      },
      {
        "line": 88,
        "character": 35
      }
    ],
    "source": "dart",
    "code": {
      "value": "prefer-match-file-name",
      "target": {
        "$mid": 1,
        "fsPath": "/docs/individuals/rules/common/prefer-match-file-name",
        "path": "/docs/individuals/rules/common/prefer-match-file-name",
        "scheme": "https",
        "authority": "dcm.dev"
      }
    }
  }
]

Document has 88 lines: Error: Illegal value for `line`
T @ console.ts:137
$logExtensionHostMessage @ mainThreadConsole.ts:39
N @ rpcProtocol.ts:455
M @ rpcProtocol.ts:440
H @ rpcProtocol.ts:370
G @ rpcProtocol.ts:296
(anonymous) @ rpcProtocol.ts:161
invoke @ event.ts:718
deliver @ event.ts:926
fire @ event.ts:887
fire @ ipc.net.ts:671
ne.onmessage @ localProcessExtensionHost.ts:615
console.ts:137 [Extension Host] Attempt to build Ignore fixes was after cancellation