macro x match: (ts: Block) :=
  { obj = Object clone

    (obj) match-on: x := raise: @(no-matches-for: x)

    ts contents each:
      { pair |
        [p, e] = pair targets
        @match-on: define-on: [obj, p as: Pattern] as:
          `({ delegates-to: sender; ~e } call) in: Lobby
      }

    `(~obj match-on: ~x)
  } call