Yes, that in fact is now the trend for the Rust crates writers: it is now common to leave a ::prelude containing a small subset of the imports usually needed to write out programs for the common use-cases.
It is a very beginners friendly practice, but it is useful also for the more seasoned programmers.
In any case, rustc alerts you of the unused imports, so feel free to add 'use's when you are trying things out, and then clean the code once the program works.
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Yes, that in fact is now the trend for the Rust crates writers: it is now common to leave a ::prelude containing a small subset of the imports usually needed to write out programs for the common use-cases.
It is a very beginners friendly practice, but it is useful also for the more seasoned programmers.
In any case, rustc alerts you of the unused imports, so feel free to add 'use's when you are trying things out, and then clean the code once the program works.