FIX: Apply copilot hints

base/src/expressions/parser/static_analysis.rs

@@ -5,11 +5,12 @@ use super::Node;
 use regex::Regex;
 use std::sync::OnceLock;
 
-static RE: OnceLock<Regex> = OnceLock::new();
+static RANGE_REFERENCE_REGEX: OnceLock<Regex> = OnceLock::new();
 
 #[allow(clippy::expect_used)]
 fn get_re() -> &'static Regex {
-    RE.get_or_init(|| Regex::new(r":[A-Z]*[0-9]*$").expect("Regex is known to be valid"))
+    RANGE_REFERENCE_REGEX
+        .get_or_init(|| Regex::new(r":[A-Z]*[0-9]*$").expect("Regex is known to be valid"))
 }
 
 fn is_range_reference(s: &str) -> bool {

base/src/locale/mod.rs

@@ -76,5 +76,5 @@ fn get_locales() -> &'static HashMap<String, Locale> {
 pub fn get_locale(id: &str) -> Result<&Locale, String> {
     get_locales()
         .get(id)
-        .ok_or_else(|| "Invalid locale".to_string())
+        .ok_or_else(|| format!("Invalid locale: '{id}'"))
 }