Structures
The following structures are available globally.
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                  Additional struct with utility methods to work with coroutines. Important Allawait()methods must be called inside a coroutine.To check if inside a coroutine, use See moreCoroutine.isInsideCoroutine. If you callawait()outside the coroutine, the precondition inside these methods will fail, and you'ill get an error. In -Ounchecked builds, where preconditions are not evaluated to avoid any crashes, a thread-blocking mechanism is used for waiting the result.DeclarationSwift public struct Coroutine
 Structures  Reference
        Structures  Reference