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Disclaimer

My questions may not be suitable with the policy of asking questions in StackOverflow, it may be too broad or out of scope.

But there is a reason why I was curious. I watched Java Value Objects in Action with Valhalla - JEP Café #15 and saw this project is going to introduce a few new keywords, viz., value and identity etc.

This makes me think about how OpenJDK developers write and test new keywords or syntaxes etc. unless there is an IDE that is compatible with them; or do they write code in some plain text editor, which I find inconvenient nowadays!

Thank you for your insight.

Update-1

Thanks for giving negative rating; but I request please let me know why my question is below standard in the comment section.

Update-2

I am looking for answer from them who contributes to OpenJDK, hence this is not opinion based question.

Update-3

Clarification of

unless there is an IDE that is compatible with them

The developers can use any IDE they prefer, but if the IDE does not support new syntaxes, won't they give 开发者_高级运维error?