Use of unstable library feature prevents compiling about kontroli-rs HOT 3 CLOSED

This error message comes from a dependency of Kontroli.
I am currently rewriting a rather large part of Kontroli and will update the README once this is done, but until then, I can compile Kontroli just fine using Rust 1.51. :)
(I remember having had a problem with updating to Rust 1.53, though, but as I was in the middle of a larger step, I did not research it yet. Just be aware of that if it fails with 1.53.)

from kontroli-rs.

You can install Rust 1.51 with rustup toolchain install 1.51.

from kontroli-rs.

The minimal Rust version for Kontroli is now set to 1.56 and checked by the compiler, so error messages such as those encountered by you should not appear anymore.

from kontroli-rs.