Capturing ‘async let’ variables is not supported

Discovered this strange error in Swift, when using the sample code from the proposal which is supposed to have been accepted and implemented

• Status: Implemented (Swift 5.5)

async let and closures

Because async let tasks cannot out-live the scope in which they are defined, passing them to closures needs some further discussion for what is legal and not.

It is legal to capture a async let in a non-escaping asynchronous closure, like this:

func greet(_ f: () async -> String) async -> String { 
   await f() 
} 

async let name = "Alice"
await greet { await name }