Rust offers a powerful trait system that allows us to write highly polymorphic and reusable code. However, the restrictions of coherence and orphan rules have been a long standing problem and a source of confusion, limiting us from writing trait implementations that are more generic than they could have been.
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(This is where the famous “but first, we will need to talk about parallel universes” quote comes from. In the SM64 community, covering spaces are known as “parallel universes”). Wheather intentional (like in Pacman) or unintentional (like in Super Mario 64, due to casting floating point numbers to short ints), it is often the case that walking in a straight line long enough will eventually lead you back to the same point.