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Does anyone use Hack outside of Facebook. Disclaimer: it’s been years since I looked at it and even at the time it was a very cursory look as PHP 7 was buzzing.

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I believe Slack committed to it at some point, maybe they didn't get off it when Facebook announced they will not keep up with PHP itself anymore.

I got a 500 error with stack trace mentioning a hack file from slack last week.

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