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Diffstat (limited to 'src/doc/rustc-dev-guide')
| -rw-r--r-- | src/doc/rustc-dev-guide/src/macro-expansion.md | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/src/doc/rustc-dev-guide/src/macro-expansion.md b/src/doc/rustc-dev-guide/src/macro-expansion.md index da4615128a2..a7777e80c3e 100644 --- a/src/doc/rustc-dev-guide/src/macro-expansion.md +++ b/src/doc/rustc-dev-guide/src/macro-expansion.md @@ -2,12 +2,13 @@ Macro expansion happens during parsing. `rustc` has two parsers, in fact: the normal Rust parser, and the macro parser. During the parsing phase, the normal -Rust parser will call into the macro parser when it encounters a macro -definition or macro invocation (TODO: verify). The macro parser, in turn, may -call back out to the Rust parser when it needs to bind a metavariable (e.g. -`$my_expr`) while parsing the contents of a macro invocation. The code for macro -expansion is in [`src/libsyntax/ext/tt/`][code_dir]. This chapter aims to -explain how macro expansion works. +Rust parser will set aside the contents of macros and their invokations. Later, +before name resolution, macros are expanded using these portions of the code. +The macro parser, in turn, may call the normal Rust parser when it needs to +bind a metavariable (e.g. `$my_expr`) while parsing the contents of a macro +invocation. The code for macro expansion is in +[`src/libsyntax/ext/tt/`][code_dir]. This chapter aims to explain how macro +expansion works. ### Example |