Yuichiro Kaneko
Yuichiro Kaneko

Ruby committer.

What is expected?

CRuby uses Bison to generate its parser. The parser is called LALR(1) parser in which we can determine what should do (shift/reduce/accept/error) next based on current state and next input token.

But current CRuby does not have "expected_tokens" method because it is more difficult than expected. Then I will talk what is difficulty and how to implement it.