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add more details about cargo fetch and when it will regen cargo.lock #15483

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add more details about cargo fetch and when it will regen cargo.lock #15483

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4 changes: 4 additions & 0 deletions src/doc/src/commands/cargo-fetch.md
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Expand Up @@ -17,6 +17,10 @@ fetch` unless the lock file changes.
If the lock file is not available, then this command will generate the lock
file before fetching the dependencies.

If the lock file is not compatible with the current `Cargo.toml`, then this
command will initiate dependency resolution from the current `Cargo.toml` file,
and update the lock file.

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https://doc.rust-lang.org/nightly/cargo/commands/cargo-fetch.html#option-cargo-fetch---locked

This is mentioned in --locked flag. Unsure if we need to emphasize it here.

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Also, if we change something, we should probably think holistically. This isn't the only command like this.

If `--target` is not specified, then all target dependencies are fetched.

See also the [cargo-prefetch](https://crates.io/crates/cargo-prefetch)
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