[Bug 2020000] Re: Merge Cargo source package into Rust

[Zixing Liu]

Hi Simon,

I have added `Recommends: rust-doc` to the cargo-doc package.

After investigating and carefully considering the binary version situation, I decided to let the cargo binary package honour the rustc package version.
The reasonings are as follows:

- The Cargo crate version is only meant to be used when using Cargo as a library instead of a tool.
- Currently, Cargo and Rustc are released in sync; there will not be a situation where a new Rust release does not contain a new release of Cargo.
- Cargo, when building with Rustc, reports the Rustc version.

For the autopkgtest, I will remember to work on that after this merge.

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https://bugs.launchpad.net/bugs/2020000

Title:
  Merge Cargo source package into Rust

Status in cargo package in Ubuntu:
  New
Status in rustc package in Ubuntu:
  New

Bug description:
  This bug report tracks the progress where we merge the Cargo source
  package into Rust source package in Ubuntu.

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