gistfile1.txt

$ cargo install perfcnt

gives this when building raw-cpuid crate:

error[E0554]: #![feature] may not be used on the stable release channel
 --> /home/sean/.cargo/registry/src/github.com-1ecc6299db9ec823/raw-cpuid-2.0.2/src/lib.rs:1:1
  |
1 | #![feature(prelude_import, asm)]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^


$ cargo +nightly install perfcnt

gives this error on `x86` crate:

error[E0635]: unknown feature `convert`
 --> /home/sean/.cargo/registry/src/github.com-1ecc6299db9ec823/x86-0.6.2/build.rs:1:54
  |
1 | #![cfg_attr(feature = "performance-counter", feature(convert))]
  |                                                      ^^^^^^^