Brendan Zabarauskas 936d999b52 Use common variants for open and close delimiters
This common representation for delimeters should make pattern matching easier. Having a separate `token::DelimToken` enum also allows us to enforce the invariant that the opening and closing delimiters must be the same in `ast::TtDelimited`, removing the need to ensure matched delimiters when working with token trees.
2014-10-30 09:35:52 +11:00
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2014-10-29 11:43:07 -04:00