# Pastebin OWvxVvx3
        let remainder = parts.slice(1, parts.size())
                                  ^
    Info:
    /Users/kevin/Code/Pony/ponymud/std/player.pony:59:27: receiver type: Array[String val] iso!
                let remainder = parts.slice(1, parts.size())
                              ^
    /usr/local/Cellar/ponyc/0.16.0/packages/builtin/array.pony:457:3: target type: Array[String val] box
      fun slice(
      ^
    /usr/local/Cellar/ponyc/0.16.0/packages/builtin/string.pony:961:5: Array[String val] iso! is not a subtype of Array[String val] box: iso! is not a subcap of box
        : Array[String] iso^
        ^
    /usr/local/Cellar/ponyc/0.16.0/packages/builtin/string.pony:961:21: this would be possible if the subcap were more ephemeral
        : Array[String] iso^
                        ^
    /Users/kevin/Code/Pony/ponymud/std/player.pony:59:35: this would be possible if the arguments and return value were all sendable
                let remainder = parts.slice(1, parts.size())