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Stabilize the re_rebalance_coherence feature

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Ohad Ravid 2019-10-26 17:28:02 +02:00
parent 92df638162
commit 026aee62ac
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src/doc/unstable-book/src/language-features/re-rebalance-coherence.md
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# `re_rebalance_coherence`
The tracking issue for this feature is: [#55437]
[#55437]: https://github.com/rust-lang/rust/issues/55437
------------------------
The `re_rebalance_coherence` feature tweaks the rules regarding which trait
impls are allowed in crates.
The following rule is used:
Given `impl<P1..=Pn> Trait<T1..=Tn> for T0`, an impl is valid only if at
least one of the following is true:
- `Trait` is a local trait
- All of
- At least one of the types `T0..=Tn` must be a local type. Let `Ti` be the
first such type.
- No uncovered type parameters `P1..=Pn` may appear in `T0..Ti` (excluding
`Ti`)
See the [RFC](https://github.com/rust-lang/rfcs/blob/master/text/2451-re-rebalancing-coherence.md) for details.