[
  {
    key.kind: source.lang.swift.ref.struct,
    key.offset: 18,
    key.length: 3,
    key.is_system: 1
  },
  {
    key.kind: source.lang.swift.ref.struct,
    key.offset: 91,
    key.length: 4,
    key.is_system: 1
  }
]
[
  {
    key.line: 8,
    key.column: 1,
    key.filepath: t2.swift,
    key.severity: source.diagnostic.severity.error,
    key.description: "missing return in a function expected to return 'Bool'",
    key.diagnostic_stage: source.diagnostic.stage.swift.sema
  }
]