auto merge of #18365 : bjz/rust/token, r=alexcrichton
[breaking-change] (for syntax-extensions) - Token variant identifiers have been converted to PascalCase for consistency with Rust coding standards - Some free-functions in `syntax::token` have been converted to methods on `syntax::token::Token`: - `can_begin_expr` -> `Token::can_begin_expr` - `close_delimiter_for` -> `Token::get_close_delimiter` - `is_lit` -> `Token::is_lit` - `is_ident` -> `Token::is_ident` - `is_path` -> `Token::is_path` - `is_plain_ident` -> `Token::is_plain_ident` - `is_lifetime` -> `Token::is_lifetime` - `is_mutability` -> `Token::is_mutability` - `to_binop` -> `Token::to_binop` - `is_keyword` -> `Token::is_keyword` - `is_any_keyword` -> `Token:is_any_keyword` - `is_strict_keyword` -> `Token::is_strict_keyword` - `is_reserved_keyword` -> `Token::is_reserved_keyword` - `mtwt_token_eq` -> `Token::mtwt_eq` - `token::Ident` now takes an enum instead of a boolean for clarity - `token::{to_string, binop_to_string}` were moved to `pprust::{token_to_string, binop_to_string}`
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