enum DisplayStyle A suggestion of how a mirror's subject is to be interpreted. Playgrounds and the debugger will show a representation similar to the one used for instances of the kind indicated by the DisplayStyle case name when the mirror is used for display. Cases case class Required Declaration case class case collection Required Declaration case collection case dictionary Required Declaration case dictionary case enum Required Declaration case enum case optional Required Declaration case optional case set Required Declaration case set case struct Required Declaration case struct case tuple Required Declaration case tuple