memoffset 0.5.0

offset_of functionality for Rust structs.
Documentation 
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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("1.36.0").unwrap() {
        println!("cargo:rustc-cfg=memoffset_maybe_uninit");
    }
}