//! 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");}