tld_test.rs

use std::local_data;

trait Locale {
  fn to_upper(&self, s: &str) {}
}

struct Indifferent;
impl Locale for Indifferent {}

local_data_key!(key_current_locale: &'static Locale)

static indifferent: Indifferent = Indifferent;

fn current() -> &Locale {
  local_data::get(key_current_locale, |_opt| &indifferent as &Locale)
}