Pitch: Multi-statement if/switch/do expressions

What about simply allowing other expressions as long as they evaluate to ()?

let backgroundColor: Color =
    switch colorScheme {
    case .light: .white
    case .dark: .charcoal
    @unknown default:
    // Upon writing this I realized that it
    // would parse as `Void.white`, and that
    // therefore we should have some keyword or sigil...
        log("Unrecognized `colorScheme`: \(colorScheme)")
        .white
    }

I'll throw -> into the ring for consideration, even though leaving aside the stylistic question it might be completely untenable just in terms of parsing complexity:

let backgroundColor: Color =
    switch colorScheme {
    case .light: .white
    case .dark: .charcoal
    @unknown default:
        log("Unrecognized `colorScheme`: \(colorScheme)")
        -> .white
    }