docs: Mention that rust edition/standard 2018 or later should be used #13756
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As the 2018 standard changes the way rust handles externs, and is the first edition that allows `--extern crate=path` to completely replace (in all but a few corner cases) the use of `extern crate` in the rust files.
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As the 2018 standard changes the way rust handles externs, and is the first edition that allows
--extern crate=pathto completely replace (in all but a few corner cases) the use ofextern cratein the rust files.