// This could be a cargo build script
extern crate rustc_version;
use rustc_version::{version, version_meta, Channel};
fn main() {
// Assert we haven't travelled back in time
assert!(version().unwrap().major >= 1);
// Set cfg flags depending on release channel
match version_meta().unwrap().channel {
Channel::Stable => {
println!("cargo:rustc-cfg=RUSTC_IS_STABLE");
}
Channel::Beta => {
println!("cargo:rustc-cfg=RUSTC_IS_BETA");
}
Channel::Nightly => {
println!("cargo:rustc-cfg=RUSTC_IS_NIGHTLY");
}
Channel::Dev => {
println!("cargo:rustc-cfg=RUSTC_IS_DEV");
}
}
}