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in this example we have a cargo project called draw with a single library crate this simple library has one public top level function called drawline which takes two points on a graph x and y it also has two modules color and shapes the color module also has a draw line function with an extra color parameter and finally the shapes module has one struct called rectangle with three fields color width and height notice that to represent color we use the rgb crate and we also use certain to be able to serialize and deserialize the rectangle struct now this library is very small but imagine it was a lot bigger we dont want consumers of the library to pay for behavior that they dont use this is where cargo features come in handy cargo features allow us to do two things first they allow us to define parts of our code that are conditionally compiled only if a certain feature is turned on and secondly they allow us to define optional dependencies the advantage of using features is that they