extern crate rustc_version;
use rustc_version::{version, Version};
fn main() {
// Assert we haven't travelled back in time
assert!(version().unwrap().major >= 1);
// Check for a minimum version
if version().unwrap() >= Version::parse("1.33.0").unwrap() {
println!("cargo:rustc-cfg=memoffset_constant_expression");
}
}