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Update some unstable docs #7407

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Sep 22, 2019
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Update some unstable docs #7407

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13 changes: 13 additions & 0 deletions src/doc/src/reference/unstable.md
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Expand Up @@ -12,6 +12,7 @@ Some unstable features will require you to specify the `cargo-features` key in

### no-index-update
* Original Issue: [#3479](https://github.com/rust-lang/cargo/issues/3479)
* Tracking Issue: [#7404](https://github.com/rust-lang/cargo/issues/7404)

The `-Z no-index-update` flag ensures that Cargo does not attempt to update
the registry index. This is intended for tools such as Crater that issue many
Expand Down Expand Up @@ -353,6 +354,7 @@ the [issue tracker](https://github.com/rust-lang/wg-cargo-std-aware/issues) of
the tracking repository, and if it's not there please file a new issue!

### timings
* Tracking Issue: [#7405](https://github.com/rust-lang/cargo/issues/7405)

The `timings` feature gives some information about how long each compilation
takes, and tracks concurrency information over time.
Expand Down Expand Up @@ -411,3 +413,14 @@ Tips for addressing compile times:
- Split large crates into smaller pieces.
- If there are a large number of crates bottlenecked on a single crate, focus
your attention on improving that one crate to improve parallelism.

### binary-dep-depinfo
* Tracking rustc issue: [#63012](https://github.com/rust-lang/rust/issues/63012)

The `-Z binary-dep-depinfo` flag causes Cargo to forward the same flag to
`rustc` which will then cause `rustc` to include the paths of all binary
dependencies in the "dep info" file (with the `.d` extension). Cargo then uses
that information for change-detection (if any binary dependency changes, then
the crate will be rebuilt). The primary use case is for building the compiler
itself, which has implicit dependencies on the standard library that would
otherwise be untracked for change-detection.