code.swift

var vendingMachine = VendingMachine()
vendingMachine.coinsDeposited = 8
do {
    try buyFavoriteSnack(person: "Alice", vendingMachine: vendingMachine)
    print("Success! Yum.")
} catch VendingMachineError.invalidSelection {
    print("Invalid Selection.")
} catch VendingMachineError.outOfStock {
    print("Out of Stock.")
} catch VendingMachineError.insufficientFunds(let coinsNeeded) {
    print("Insufficient funds. Please insert an additional \(coinsNeeded) coins.")
} catch {
    print("Unexpected error: \(error).")
}

func summarize(_ ratings: [Int]) throws(StatisticsError) {
    guard !ratings.isEmpty else { throw .noRatings }
}

async let data = fetchUserData(id: 1)
async let posts = fetchUserPosts(id: 1)
let (fetchedData, fetchedPosts) = try await (data, posts)