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Document how to mark features as incomplete (#1151) 

* Document how to mark features as incomplete

This was changed in https://github.com/rust-lang/rust/pull/86446 so that
incompleteness is included in the delcaration.

* Footerify link
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Smittyvb 2021-06-29 12:41:13 -04:00 committed by GitHub
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9
src/feature-gates.md
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@ -27,6 +27,14 @@ For example:
(active, non_ascii_idents, "1.0.0", Some(55467), None),
```
Features can be marked as incomplete, and trigger the warn-by-default [`incomplete_features` lint]
by setting their type to `incomplete`:
```rust,ignore
/// Allows unsized rvalues at arguments and parameters.
(incomplete, unsized_locals, "1.30.0", Some(48055), None),
```
When added, the current version should be the one for the current nightly.
Once the feature is moved to `accepted.rs`, the version is changed to that
nightly version.
@ -99,4 +107,5 @@ updating the declaration!
["Stability in code"]: ./implementing_new_features.md#stability-in-code
[`incomplete_features` lint]: https://doc.rust-lang.org/rustc/lints/listing/warn-by-default.html#incomplete-features
["Updating the feature-gate listing"]: ./stabilization_guide.md#updating-the-feature-gate-listing