I'm happy to announce we improved support for Rust in CoCalc, an online platform for collaborative calculation. The stable, beta and nightly channels are available out of the box: software update 2019-11-19.
~$ rustc --version rustc 1.39.0 (4560ea788 2019-11-04) ~$ rustc +beta --version rustc 1.40.0-beta.2 (2a0ba54fa 2019-11-16) ~$ rustc +nightly --version rustc 1.41.0-nightly (5c5b8afd8 2019-11-16)
Editing code files in the frame editor supports code formatting via
rustfmt as well.