concurrency-async-let.swift

// RUN: %empty-directory(%t)
// RUN: %target-swift-frontend -enable-experimental-feature Embedded -parse-as-library %s -c -o %t/a.o
// RUN: %target-clang %t/a.o -o %t/a.out -L%swift_obj_root/lib/swift/embedded/%target-cpu-apple-macos -lswift_Concurrency -lswift_ConcurrencyDefaultExecutor -dead_strip
// RUN: %target-run %t/a.out | %FileCheck %s

// REQUIRES: executable_test
// REQUIRES: swift_in_compiler
// REQUIRES: optimized_stdlib
// REQUIRES: OS=macosx
// REQUIRES: swift_feature_Embedded

import _Concurrency

func fib(_ n:Int)->Int{
varfirst=0
varsecond=1
for_in0..<n {
lettemp= first
 first = second
 second = temp + first
}
return first
}

@available(SwiftStdlib 5.1,*)
func asyncFib(_ n:Int)async->Int{
if n ==0 || n ==1{
return n
}

asyncletfirst=awaitasyncFib(n-2)
asyncletsecond=awaitasyncFib(n-1)

letresult=await first + second

return result
}

@available(SwiftStdlib 5.1,*)
func runFibonacci(_ n:Int)async{
letresult=awaitasyncFib(n)

print("")
print(result ==fib(n)?"OK!":"???")
 // CHECK: OK!
}

@available(SwiftStdlib 5.1,*)
@mainstructMain{
staticfunc main()async{
awaitrunFibonacci(10)
}
}