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Update stability.md

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Oliver Scherer 2019-08-21 17:06:05 +02:00 committed by Who? Me?!
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@ -11,6 +11,10 @@ The `#[unstable(feature = "foo", issue = "1234", reason = "lorem ipsum")]` attri
marks an item as unstable. This 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.
You can make specific sub-items stable by using the `#[stable]` attribute on them.
The stability scheme works similarly to how `pub` works. You can have public functions of
nonpublic modules and you can have stable functions in unstable modules or vice versa.
# stable
The `#[stable(feature = "foo", "since = "1.420.69")]` attribute explicitly marks an item as