Hi.
"Nightly" build of Rust by Example is not up to date with its GIT 'master' branch. (An example of difference: for and range - Rust By Example > code example for iter_mut vs. the respective example at https://github.com/rust-lang/rust-by-example/blob/master/src/flow_control/for.md#for-and-iterators.)
Is there any published version based on master, or any plan for it, please?