error[E0554]: #![feature] may not be used on the stable release channel Couldn't install racer using cargo
Full error message
I'm trying to install racer using cargo, so I executed the command cargo install racer in the terminal and it resulted in the error: error[E0554]: #![feature] may not be used on the stable release channel --> /home/rajkumar/.cargo/registry/src/github.com-1ecc6299db9ec823/scoped-tls-0.1.2/src/lib.rs:47:34 | 47 | #![cfg_attr(feature = "nightly", feature(macro_vis_matcher))] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ error[E0554]: #![feature] may not be used on the stable release channel --> /home/rajkumar/.cargo/registry/src/github.com-1ecc6299db9ec823/scoped-tls-0.1.2/src/lib.rs:48:34 | 48 | #![cfg_attr(feature = "nightly", feature(allow_internal_unstable))] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0554`. error: failed to compile `racer v2.1.10`, intermediate artifacts can be found at `/tmp/cargo-install5YWPWW` Caused by: Could not compile `scoped-tls`. To learn more, run the command again with --verbose. Below are my Rust details: $rustc --version rustc 1.30.0 (da5f414c2 2018-10-24) > rustup --version rustup 1.14.0 (1e51b07cc 2018-10-04) > cargo --version cargo 1.30.0 (36d96825d 2018-10-24) Below is my opensuse version details: > cat /usr/lib/os-release NAME="openSUSE Tumbleweed" # VERSION="20181029" ID="opensuse-tumbleweed" ID_LIKE="opensuse suse" VERSION_ID="20181029" PRETTY_NAME="openSUSE Tumbleweed" ANSI_COLOR="0;32" CPE_NAME="cpe:/o:opensuse:tumbleweed:20181029" BUG_REPORT_URL="https://bugs.opensuse.org" HOME_URL="https://www.opensuse.org/" Why am I not able to install racer using cargo? Am I missing anything?
Solutionsource: stackoverflow \u2197
As the error message states, you cannot compile that code with stable Rust. You need to install nightly Rust and then use it to compile the program: rustup install nightly cargo +nightly install racer See also: How to execute cargo test using the nightly channel? Is it possible to have multiple coexisting Rust installations? Rocket requires a minimum version of Rust nightly, but a higher stable version is already installed
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