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Small tweaks to the future-incompat docs.

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Eric Huss 2022-07-12 17:38:19 -07:00
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src/doc/src/reference/future-incompat-report.md
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### Future incompat report
Cargo checks for future-incompatible warnings in all dependencies. These are warnings for
Cargo checks for future-incompatible warnings in all dependencies. These are warnings for
changes that may become hard errors in the future, causing the dependency to
stop building in a future version of rustc. If any warnings are found, a small
notice is displayed indicating that the warnings were found, and provides
instructions on how to display a full report.
For example, you may see something like this at the end of a build:
```text
warning: the following packages contain code that will be rejected by a future
version of Rust: rental v0.5.5
note: to see what the problems were, use the option `--future-incompat-report`,
or run `cargo report future-incompatibilities --id 1`
```
A full report can be displayed with the `cargo report future-incompatibilities
--id ID` command, or by running the build again with
the `--future-incompat-report` flag. The developer should then update their
dependencies to a version where the issue is fixed, or work with the
developers of the dependencies to help resolve the issue.
This feature can be configured through a `[future-incompat-report]`
section in `.cargo/config`. Currently, the supported options are:
## Configuration
```
This feature can be configured through a [`[future-incompat-report]`][config]
section in `.cargo/config.toml`. Currently, the supported options are:
```toml
[future-incompat-report]
frequency = FREQUENCY
frequency = "always"
```
The supported values for `FREQUENCY` are `always` and `never`, which control
The supported values for the frequency are `"always"` and `"never"`, which control
whether or not a message is printed out at the end of `cargo build` / `cargo check`.
[config]: config.md#future-incompat-report