Doesn't print in colour and messes up re-printing in the same line

[ghost]

When I update Rust, it looks like this:

I'm using Windows 10 Home Single Language, Version 1803.
I use Hyper as my terminal emulator (I just love its UI). It auto-updates, but I don't think the version of Hyper is relevant because it has done this for every update I've done.
Right now, I have rustup 1.11.0 (e751ff9f8 2018-02-13).

Using powershell doesn't print in colour but re-printing on the same line works.

[pmarcelll]

The color issue is probably vercel/hyper#2038.

[pmarcelll]

I investigated a bit, this line is responsible for clearing the line:

https://github.com/rust-lang-nursery/rustup.rs/blob/bb6f65f08ba3e8a6619a033b65611be0f0023e73/src/rustup-cli/download_tracker.rs#L163

It looks like this is a bug in term, or a bug in hyper. It's also worth mentioning, that the Result from the carriage_return() method is completely ignored here, so it might be possible to retrieve an error message from this method.

[pmarcelll]

Changing the line in question to unwrap() yields:

?[1minfo: ?[0msyncing channel updates for 'stable-x86_64-pc-windows-msvc'
?[1minfo: ?[0mlatest update on 2018-06-21, rust version 1.27.0 (3eda71b00 2018-06-19)
?[1minfo: ?[0mdownloading component 'rustc'
Total:   6.9 MiB Speed:   0 B/s                thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: NotSupported', libcore\result.rs:945:5

So carriage_return() does something that is not supported in hyper. Other terminals work correctly, so this is either a missing feature in hyper, or term needs a workaround (because regular \r works).

[joshtriplett]

Since this issue lies either in hyper or in term (or both), and apparently not in rustup, could you please report it on one of those two crates instead?