I am new to rust. I am going through the cargo book, on the features chapter there is a concept that I am unable understand.
It is mentioned that if a optional dependency will be included only if a feature uses it.
rgb will be enabled if if something else has enabled the rgb dependency.rgb dependency.
It won't. All that enabling the serde feature does in relation to the rgb dependency is that it will enable its serde feature, only if some other feature has enabled the rgb crate in the first place. If no other feature enables the rgb crate as a dependency, the serde feature won't enable rgb and the rgb?/serde expression becomes a no op, unlike rgb/serde, which would enable the rgb dependency, with the serde feature (the difference between these two being the ? operator behind the crate name).
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