error: the `#[compiler_builtins]` attribute is used to identify the `compiler_builtins` crate which contains compiler-rt intrinsics and will never be stable --> $DIR/feature-gate-compiler-builtins.rs:11:1 | 11 | #![compiler_builtins] //~ ERROR the `#[compiler_builtins]` attribute is | ^^^^^^^^^^^^^^^^^^^^^ | = help: add #![feature(compiler_builtins)] to the crate attributes to enable error: aborting due to previous error