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由 Keegan McAllister 提交于
macro_rules! is like an item that defines a macro. Other items don't have a trailing semicolon, or use a paren-delimited body. If there's an argument for matching the invocation syntax, e.g. parentheses for an expr macro, then I think that applies more strongly to the *inner* delimiters on the LHS, wrapping the individual argument patterns.
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