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Update stability documentation, mention `issue = "none"`

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Ross MacArthur 2019-12-22 17:21:02 +02:00 committed by Who? Me?!
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@ -14,6 +14,10 @@ attribute explicitly marks an item as unstable. Items that are marked as
the crate, even on a nightly compiler. This restriction only applies across
crate boundaries, unstable items may be used within the crate they are defined.
The `issue` field specifies the associated GitHub [issue number]. This field is
required and all unstable features should have an associated tracking issue. In
rare cases where there is no sensible value `issue = "none"` is used.
The `unstable` attribute infects all sub-items, where the attribute doesn't
have to be reapplied. So if you apply this to a module, all items in the module
will be unstable.
@ -33,6 +37,7 @@ future-incompatible deny-by-default lint instead of a hard error. This is used
by the `bench` attribute which was accidentally accepted in the past. This
prevents breaking dependencies by leveraging Cargo's lint capping.
[issue number]: https://github.com/rust-lang/rust/issues
[rustc bug]: https://github.com/rust-lang/rust/issues/15702
## stable