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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 f4a8352501
commit 0d2e27c3d0
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5
src/doc/rustc-dev-guide/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].