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Clarify that macros are expr-positioned.

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Paul Stansifer 2012-08-23 15:06:03 -07:00
parent e9622f09aa
commit 0698fc6650
1 changed files with 5 additions and 0 deletions
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@ -2411,6 +2411,11 @@ The right-hand side of the `=>` follows the same rules as the left-hand side,
except that `$` need only be followed by the name of the syntactic fragment except that `$` need only be followed by the name of the syntactic fragment
to transcribe. to transcribe.
The right-hand side must be surrounded by delimiters of some kind, and must be
an expression; currently, user-defined macros can only be invoked in
expression position (even though `macro_rules!` itself can be in item
position).
## Multiplicity ## Multiplicity
### Invocation ### Invocation