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b18a8c3036
To understand From-based conversion, an understanding of traits is required, which we teach in a later chapter. The From trait specifically is taught in one of the conversion exercises. So, we can safely remove it here without users missing out on learning something important. A specific source of confusion for users was a warning that the conversion is useless, which appeared when using the `string_slice` function for the expression with `.into()`. closes #2190
Official Rustlings solutions
Before you finish an exercise, its solution file will only contain an empty main function.
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