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courses/rust/projects/project-1: Add note about clap 3.x #412

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What problem does this PR solve?

What is changed and how it works?

  • We add a note at the top of the guide, letting the readers to find out the difference between clap 2.x and 3.x by themselves. By this way, we can make the reader to do more exercise on reading docs and make them get used to the quickly changing rust ecosystem.
  • The readers can decide to still use the 2.x or upgrade to the 3.x by themselves, both way is ok.

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yanguwan commented Jun 6, 2022

"and after knowing the difference, you can choose to skip some of the steps in this guide." Can we point out what steps should be skipped once clap 3.x is used.

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myrfy001 commented Jun 6, 2022

In my opinion, reading the document and change log of other opensource projects is also a challenge. I think we shouldn't tell how to do it directly.

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Rust Project 1: structopt is not needed with clap 3.0
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