Swift has placeholder types as of 5.6, more about them here: https://github.com/apple/swift-evolution/blob/main/proposals/0315-placeholder-types.md https://gith

Swift has placeholder types as of 5.6, more about them here: https://github.com/apple/swift-evolution/blob/main/proposals/0315-placeholder-types.md https://github.com/apple/swift-evolution/blob/main/proposals... I mainly use Swift these days but I haven't had a need for them yet so was asking out of curiosity.