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Rollup merge of #38163 - durka:patch-33, r=bluss

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reference: fix definition of :tt

The reference says that $x:tt matches "either side of the `=>` in macro_rules` which is technically true but completely uninformative. This changes that bullet point to what the book says (a single token or sequence of token trees inside brackets).
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Guillaume Gomez 2016-12-07 10:42:52 -08:00 committed by GitHub
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@ -603,7 +603,8 @@ syntax named by _designator_. Valid designators are:
* `ty`: a [type](#types)
* `ident`: an [identifier](#identifiers)
* `path`: a [path](#paths)
* `tt`: either side of the `=>` in macro rules
* `tt`: a token tree (a single [token](#tokens) or a sequence of token trees surrounded
by matching `()`, `[]`, or `{}`)
* `meta`: the contents of an [attribute](#attributes)
In the transcriber, the