[question] How do the static members of Task work?

[ibex]

@vns

Via withUnsafeCurrentTask, you can check it in source code: swift/stdlib/public/Concurrency/TaskCancellation.swift at 638950c0411ca201aca626ab92d85cd35bb5d59b · swiftlang/swift · GitHub

@Diggory

 extension Task where Success == Never, Failure == Never {
   static var isCancelled: Bool { 
     withUnsafeCurrentTask { task in 
       task?.isCancelled ?? false  
     }
   }
 }

Thank you, @vns, @Diggory

That got me excited, but my quest ended at _getCurrentAsyncTask; I couldn't dive any deeper.

// Task.swift
...
// ==== Internal ---------------------------------------------------------------
@available(SwiftStdlib 5.1, *)
@_silgen_name("swift_task_getCurrent")
public func _getCurrentAsyncTask() -> Builtin.NativeObject?

However, as @ktoso pointed out, the current execution context is the key to understanding how the static members of Task do their jobs.