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yaml --- r: 33199 b: refs/heads/snap-stage3 c: c639f44 h: refs/heads/master i: 33197: ac4d49d 33195: cd3c973 33191: 6646831 33183: 9987a56 v: v3
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[refs]

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refs/heads/try: d324a424d8f84b1eb049b12cf34182bda91b0024
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refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
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branches/snap-stage3/doc/rust.md

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## Macros
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User-defined syntax extensions are called "macros", and they can be defined
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with the `macro_rules!` syntax extension. User-defined macros can currently
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only be invoked in expression position.
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~~~~~~~~ {.ebnf .gram}
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~~~~ {.ebnf .gram}
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expr_macro_rules : "macro_rules" '!' ident '(' macro_rule * ')'
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macro_rule : '(' matcher * ')' "=>" '(' transcriber * ')' ';'
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matcher : '(' matcher * ')' | '[' matcher * ']'
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| '$' '(' transcriber * ')' sep_token? [ '*' | '+' ]
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| non_special_token
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~~~~
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~~~~~~~~
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User-defined syntax extensions are called "macros", and they can be defined
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with the `macro_rules!` syntax extension. User-defined macros can currently
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only be invoked in expression position.
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(A `sep_token` is any token other than `*` and `+`. A `non_special_token` is
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any token other than a delimiter or `$`.)
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Macro invocations are looked up by name, and each macro rule is tried in turn;
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the first successful match is transcribed. The matching and transcribing
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processes are close cousins, and will be described together:
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processes are closely related, and will be described together:
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### Macro By Example
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