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Beef up macro designator docs #29619

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Nov 5, 2015
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Beef up macro designator docs #29619

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17 changes: 14 additions & 3 deletions src/doc/reference.md
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Expand Up @@ -547,9 +547,20 @@ a `$` literally, including delimiters. For parsing reasons, delimiters must be
balanced, but they are otherwise not special.

In the matcher, `$` _name_ `:` _designator_ matches the nonterminal in the Rust
syntax named by _designator_. Valid designators are `item`, `block`, `stmt`,
`pat`, `expr`, `ty` (type), `ident`, `path`, `tt` (either side of the `=>`
in macro rules), and `meta` (contents of an attribute). In the transcriber, the
syntax named by _designator_. Valid designators are:

* `item`: an [item](#items)
* `block`: a [block](#block-expressions)
* `stmt`: a [statement](#statements)
* `pat`: a [pattern](#match-expressions)
* `expr`: an [expression](#expressions)
* `ty`: a [type](#types)
* `ident`: an [identifier](#identifiers)
* `path`: a [path](#paths)
* `tt`: either side of the `=>` in macro rules
* `meta`: the contents of an [attribute](#attributes)

In the transcriber, the
designator is already known, and so only the name of a matched nonterminal comes
after the dollar sign.

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