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Add an entry in the unstable book

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Matt Peterson 2017-12-21 15:35:26 -05:00
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src/doc/unstable-book/src/language-features/macro-lifetime-matcher.md Normal file
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# `macro_lifetime_matcher`
The tracking issue for this feature is: [#46895]
With this feature gate enabled, the [list of fragment specifiers][frags] gains one more entry:
* `lifetime`: a lifetime. Examples: 'static, 'a.
A `lifetime` variable may be followed by anything.
[#46895]: https://github.com/rust-lang/rust/issues/46895
[frags]: ../book/first-edition/macros.html#syntactic-requirements
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