error[E0554]: `#![feature]` may not be used on the stable release channel

[dwillmore]

I've tried to build this on two different ARM platforms (Odroid N2 running Ubuntu Jammy, Rpi4 running Debian Bullseye) and an Intel i7-8650U running Fedora 36. All three platforms return the same error.

.cargo/registry/src/github.tiyicn.workers.dev-1ecc6299db9ec823/fast-floats-0.1.2/src/lib.rs:18:1 | 18 | #![feature(core_intrinsics)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

I assume this isn't the expected result. Can this code be made to run on a release version of rust? Is this line simply not needed on a sufficiently new version? I'm not a native Rust programmer, so I don't know how to test these theories. Thank you.