macro_rules! t {
($lang:expr, $en:literal, $zh:literal) => { ... };
($lang:expr, $en:literal, $zh:literal, $($arg:tt)*) => { ... };
}Expand description
Pick between an English and a Chinese message, applying format arguments to whichever is selected.
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t!(lang, "Endpoint reachable, {}ms", "端点可达,{}ms", ms)Both literals take the same arguments, so a mismatched placeholder count is a compile error rather than a runtime surprise.