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What Now? Handling Errors in Large Systems

Cloudflare’s deep postmortem for their November 18 outage triggered a ton of online chatter about error handling, caused by a single line in the postmortem: If you’re not familiar with Rust, you need to know about Result, a kind of struct that can contain either a succesful result, or an error. unwrap says basically “return the successful results if their is one, otherwise crash the program”1.

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