/// This build script allows us to enable the `read_buf` language feature only /// for Rust Nightly. /// /// See the comment in lib.rs to understand why we need this. #[cfg_attr(feature = "read_buf", rustversion::not(nightly))] fn main() {} #[cfg(feature = "read_buf")] #[rustversion::nightly] fn main() { println!("cargo:rustc-cfg=read_buf"); }