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Update src/stability.md 

Co-Authored-By: Jake Goulding <shepmaster@mac.com>
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Oliver Scherer 2019-08-21 16:32:12 +02:00 committed by Who? Me?!
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@ -22,7 +22,7 @@ Note that stable functions may use unstable things in their body.
# allow_internal_unstable
Macros, compiler desugarings and `const fn`s expose their bodies to the call site. In order to
work around not being able to use unstable things in the standard libraries macros, there's the
work around not being able to use unstable things in the standard library's macros, there's the
`#[allow_internal_unstable(feature1, feature2)]` attribute that whitelists the given features for
usage in stable macros or `const fn`s.