Rollup merge of #28208 - matklad:grammar-whitespace-cleanup, r=steveklabnik
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@ -281,7 +281,7 @@ type_path_tail : '<' type_expr [ ',' type_expr ] + '>'
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## Macros
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```antlr
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expr_macro_rules : "macro_rules" '!' ident '(' macro_rule * ')' ';'
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expr_macro_rules : "macro_rules" '!' ident '(' macro_rule * ')' ';'
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| "macro_rules" '!' ident '{' macro_rule * '}' ;
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macro_rule : '(' matcher * ')' "=>" '(' transcriber * ')' ';' ;
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matcher : '(' matcher * ')' | '[' matcher * ']'
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