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Extra documentation for new formatting feature Documentation of this feature was added in #90473 and released in Rust 1.58. However, high traffic macros did not receive new examples. Namely `println!()` and `format!()`. The doc comments included in Rust are super important to the community- especially newcomers. I have met several other newbies like myself who are unaware of this recent (well about 7 months old now) update to the language allowing for convenient intra-string identifiers. Bringing small examples of this feature to the doc comments of `println!()` and `format!()` would be helpful to everyone learning the language. [Blog Post Announcing Feature](https://blog.rust-lang.org/2022/01/13/Rust-1.58.0.html) [Feature PR](https://github.com/rust-lang/rust/pull/90473) - includes several instances of documentation of the feature- minus the macros in question for this PR *This is my first time contributing to a project this large. Feedback would mean the world to me 😄* --- *Recreated; I violated the [No-Merge Policy](https://rustc-dev-guide.rust-lang.org/git.html#no-merge-policy)* |
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