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A comment on Announcing Rust 1.22. Parent comment

Re:Announcing Rust 1.22 by wscott on Thursday November 23, 2017 @06:17AM (#15764349)
"About a year ago, in Rust 1.13, we introduced the ? operator"

And that includes a link to the 1.13 announcement with a detailed explanation. https://blog.rust-lang.org/2016/11/10/Rust-1.13.html

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