/// 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))]fnmain(){}#[cfg(feature ="read_buf")]#[rustversion::nightly]fnmain(){println!("cargo:rustc-cfg=read_buf");}