Use common variants for open and close delimiters #18430
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brendanzab
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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.
We can simplify these usages due to the new delimiter representation. `Parser::expect_open_delim` has been added for convenience.
alexcrichton
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Oct 31, 2014
Conflicts: src/libsyntax/parse/parser.rs
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This common representation for delimeters should make pattern matching easier. Having a separate
token::DelimTokenenum also allows us to enforce the invariant that the opening and closing delimiters must be the same inast::TtDelimited, removing the need to ensure matched delimiters when working with token trees, (for example, in gl-rs)