refactor(toml): Expose surce/spans for VirtualManifests
### What does this PR try to resolve?
This is a follow up to #13593, expanding support from `Manifest` to `VirtualManifest` as well.
This also does other clean up along the way in preparation for making a more explicit `resolve_toml` phase.
### How should we test and review this PR?
### Additional information
feat: Add 'open-namespaces' feature
### What does this PR try to resolve?
This is a step towards #13576
### How should we test and review this PR?
### Additional information
We used several strategies
- Relying in `impl Ord for RustVersion`
- Converting to version requirements
- Decrementing a version
This consolidates around one strategy: `RustVersion::is_compatible_with`
- Ensure the comparisons have the same behavior
- Centralize knowledge of how to handle pre-release rustc
- Losslessly allow comparing with either rustc or workspace msrv
This uses a new feature from snapbox that let's us render terminal
styling in SVG files. This let's us see / visualize ANSI escape codes,
including in github's UI (will render images, including side-by-side
images for diffs).
fix(add): Improve error when adding registry packages while vendored
### **What does this PR try to resolve?**
When a vendored directory is established, cargo add no longer adds new packages. Instead, it tries to translate a package name into a package that already exists in the vendored directory.
[More details](https://github.com/rust-lang/cargo/issues/10729#issue-1260548746)
Since `@epage` has done most of the work, here I do the rest of the finishing work.
Improves the error from #10729
### **How should we test and review this PR?**
The implementation procedure is as follows:
https://github.com/rust-lang/cargo/issues/10729#issuecomment-1191633351
Test steps：
1. Try to get an arbitrary crate and execute `cargo vendor` command.
2. Configure the vendor directory in .cargo/config.toml.
3. Add `alter-registry` to the config.toml file.
```
[registries]
alter-registry= { index = "XXX" }
```
4. run the same `cargo add` command.
```
cargo add another-crate --registry alter-registry
```
Add global_cache_tracker stability tests.
This adds some tests to ensure that the database used in the global cache tracker stays compatible across versions. These tests work by using rustup to run both the current cargo and the stable cargo, and verifying that when switching versions, everything works as expected.
These tests will be ignored on developer environments if they don't have rustup, or don't have the stable toolchain installed. It does assume that "stable" is at least 1.76. It is required for the tests to run in CI, but will be disabled in rust-lang/rust since it does not have rustup.
I'm not expecting too much trouble with these tests, but if they become too fiddly or broken, they can always be changed or removed.
The support code for running "cargo +stable" is very basic right now. If we expand to add similar tests in the future, then I think we could consider adding support functions (such as [`tc_process`](64ccff290f/tests/testsuite/old_cargos.rs (L21-L36))) to make it easier or more reliable.
Cargo likes to modify PATH, which circumvents the ability to choose the
correct "cargo" executable to run on Windows (because Windows uses PATH
for both binary and shared library searching).
This adds the `requires_rustup_stable` option to the cargo_test macro to
require `rustup` to exist, and for the `stable` toolchain to be
installed.
It is required that stable be installed in Cargo's CI. On a developer
machine, the tests will be ignored if rustup is not installed. It will
also be ignored on rust-lang/rust's CI since it does not have rustup.
