Add an entry in the unstable book

rust-lang · Dec 28, 2017 · 0f9c9b6 · 0f9c9b6
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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
+
+------------------------