#[allow(unused_assignments, unused_mut, unused_variables)]
pub const STD: &str = {
let mut flag = "c++11";
#[cfg(feature = "c++14")]
(flag = "c++14");
#[cfg(feature = "c++17")]
(flag = "c++17");
#[cfg(feature = "c++20")]
(flag = "c++20");
flag
};