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Ie. in Rust in Rust if you want to define a struct you use the struct keyword and if you want to define an interface (more or less) you use the "trait" keyword. What if you see an identifier and don't know what type it is? How do you find its declaration? It's not the end of the world, it's just a little annoyance that makes it necessary to add more tools if you want your day to not be filled with problems.