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 This documents Rust-101, a tutorial for the [Rust
 language](http://www.rust-lang.org/).
 
+**Note that this tutorial was written for Rust 1.3 in 2015, and the language evolved a lot since then.
+Some of the idioms presented here may no longer reflect current practice.**
+
 ## Online tutorial
 
 The most accessible form of the tutorial is its