error[E0658]: linking to LLVM intrinsics is experimental --> $DIR/feature-gate-link_llvm_intrinsics.rs:3:5 | LL | fn sqrt(x: f32) -> f32; | ^^^^^^^^^^^^^^^^^^^^^^^ | = note: see issue #29602 for more information = help: add `#![feature(link_llvm_intrinsics)]` to the crate attributes to enable error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0658`.