@type t() ::
  Surface.AST.Literal.t()
  | Surface.AST.Interpolation.t()
  | Surface.AST.Expr.t()
  | Surface.AST.Tag.t()
  | Surface.AST.VoidTag.t()
  | Surface.AST.SlotEntry.t()
  | Surface.AST.Slot.t()
  | Surface.AST.If.t()
  | Surface.AST.For.t()
  | Surface.AST.Container.t()
  | Surface.AST.Component.t()
  | Surface.AST.FunctionComponent.t()
  | Surface.AST.MacroComponent.t()
  | Surface.AST.SlotableComponent.t()
  | Surface.AST.Error.t()