[
  {
    key.kind: source.lang.swift.ref.struct,
    key.offset: 9,
    key.length: 3,
    key.is_system: 1
  }
]
[
  {
    key.line: 1,
    key.column: 16,
    key.filepath: real.swift,
    key.severity: source.diagnostic.severity.error,
    key.description: "use of unresolved identifier 'goo'",
    key.diagnostic_stage: source.diagnostic.stage.swift.sema,
    key.ranges: [
      {
        key.offset: 15,
        key.length: 3
      }
    ]
  }
]