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minor grammatical fixes

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Alexander Regueiro 2018-02-01 03:57:51 +00:00 committed by Who? Me?!
parent 780e954a17
commit c95e604602
1 changed files with 3 additions and 2 deletions
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src/macro-expansion.md
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@ -134,8 +134,9 @@ it calls back to the normal Rust parser to get the contents of that
non-terminal. In this case, the Rust parser would look for an `ident` token,
which it finds (`foo`) and returns to the macro parser. Then, the macro parser
proceeds in parsing as normal. Also, note that exactly one of the matchers from
the various arms should match the invocation (otherwise, the macro is
ambiguous).
the various arms should match the invocation; if there is more than one match,
the parse is ambiguous, while if there are no matches at all, there is a syntax
error.
For more information about the macro parser's implementation, see the comments
in [`src/libsyntax/ext/tt/macro_parser.rs`][code_mp].