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diff --git a/vendor/icu_locid/examples/filter_langids.rs b/vendor/icu_locid/examples/filter_langids.rs
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+// This file is part of ICU4X. For terms of use, please see the file
+// called LICENSE at the top level of the ICU4X source tree
+// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
+
+// A sample application which takes a comma separated list of language identifiers,
+// filters out identifiers with language subtags different than `en` and serializes
+// the list back into a comma separated list in canonical syntax.
+//
+// Note: This is an example of the API use, and is not a good base for language matching.
+// For language matching, please consider algorithms such as Locale Matcher.
+
+#![no_main] // https://github.com/unicode-org/icu4x/issues/395
+
+icu_benchmark_macros::static_setup!();
+
+use std::env;
+
+use icu_locid::{subtags, LanguageIdentifier};
+
+const DEFAULT_INPUT: &str =
+    "de, en-us, zh-hant, sr-cyrl, fr-ca, es-cl, pl, en-latn-us, ca-valencia, und-arab";
+
+fn filter_input(input: &str) -> String {
+    // 1. Parse the input string into a list of language identifiers.
+    let langids = input.split(',').filter_map(|s| s.trim().parse().ok());
+
+    // 2. Filter for LanguageIdentifiers with Language subtag `en`.
+    let en_lang: subtags::Language = "en".parse().expect("Failed to parse language subtag.");
+
+    let en_langids = langids.filter(|langid: &LanguageIdentifier| langid.language == en_lang);
+
+    // 3. Serialize the output.
+    let en_strs: Vec<String> = en_langids.map(|langid| langid.to_string()).collect();
+
+    en_strs.join(", ")
+}
+
+#[no_mangle]
+fn main(_argc: isize, _argv: *const *const u8) -> isize {
+    icu_benchmark_macros::main_setup!();
+    let args: Vec<String> = env::args().collect();
+
+    let input = if let Some(input) = args.get(1) {
+        input.as_str()
+    } else {
+        DEFAULT_INPUT
+    };
+    let _output = filter_input(input);
+
+    #[cfg(debug_assertions)]
+    println!("\nInput: {}\nOutput: {}", input, _output);
+
+    0
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const DEFAULT_OUTPUT: &str = "en-US, en-Latn-US";
+
+    #[test]
+    fn ensure_default_output() {
+        assert_eq!(filter_input(DEFAULT_INPUT), DEFAULT_OUTPUT);
+    }
+}