(safeTreePrinter: StringAdd).self
(safeTreePrinter: StringFormat).self
(safeTreePrinter: ArrowAssoc[SafeTreePrinter]).x
(Since version 2.10.0) Use leftOfArrow
instead
(safeTreePrinter: Ensuring[SafeTreePrinter]).x
(Since version 2.10.0) Use resultOfEnsuring
instead
This must guarantee not to force any evaluation, so we can learn a little bit about trees in the midst of compilation without altering the natural course of events.