Typo in For the More Curious: Storing Failable…

The code following

Result has several features for working…

The code given as an example using map(_: ) on Result should read:

let numbersResult: Result<[Int], Error> = tokensResult.map { tokens in
    tokens.compactMap { token in
        switch token {
        case let .number(digit): return digit
        default: return nil

bun “tokens in” is missing.