OpenE2K
/
rust
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Beef up macro designator docs 

Fixes #28824
This commit is contained in:
Steve Klabnik 2015-11-05 16:46:56 +01:00
parent a216e84727
commit 58628b3f79
1 changed files with 14 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
src/doc/reference.md
View File

@ -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.