Macro cmd_lib::tls_init

macro_rules! tls_init {
    ($vis:vis $var:ident, $t:ty, $($var_init:tt)*) => { ... };
}

Declare a new thread local storage variable

use std::collections::HashMap;
tls_init!(LEN, u32, 100);
tls_init!(MAP, HashMap<String, String>, HashMap::new());