In real programs this whole thing is avoided by adding a single boolean or a second method. This article isn't an example of what anyone should be doing, but a

In real programs this whole thing is avoided by adding a single boolean or a second method. This article isn't an example of what anyone should be doing, but an exploration of how one can stubbornly push the language to the limit to work around a missing feature. It's Rust's equivalent of preprocessor abuse.