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next_token 

        # Racc::Parser.next_token

(from ruby core)
### Implementation from Parser
---
    next_token()

---

The method to fetch next token. If you use #do_parse method, you must
implement #next_token.

The format of return value is [TOKEN_SYMBOL, VALUE]. `token-symbol` is
represented by Ruby's symbol by default, e.g. :IDENT for 'IDENT'.  ";"
(String) for ';'.

The final symbol (End of file) must be false.

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