Rust print typenames - nightly only

print_type_names.rs

#![feature(core_intrinsics)]

fn main() {
    let x = &false;
    print_type_name_of(x);

    let ref x = false;
    print_type_name_of(x);

    let &x = &false;
    print_type_name_of(x);

    let ref x = &false;
    print_type_name_of(x);

    let z = 1;
    let x = &z;
    print_type_name_of(x);

    let z = String::from("Hello");
    let &x = &z;
    let y = z;
    print_type_name_of(x);
    print_type_name_of(y);

}

fn print_type_name_of<T>(_: T) {
    println!("{}", unsafe { std::intrinsics::type_name::<T>() })
}