Revert "Show better error message on missing configuration entry"

This reverts commit 923c660.

Author: fank

crates/lib/src/core/linter/core.rs

@@ -163,7 +163,7 @@ impl Linter {
         LintingResult { files }
     }
 
-    pub fn get_rulepack(&self) -> Result<RulePack, String> {
+    pub fn get_rulepack(&self) -> RulePack {
         let rs = get_ruleset();
         rs.get_rulepack(&self.config)
     }
@@ -663,15 +663,7 @@ impl Linter {
     }
 
     pub fn rules(&self) -> &[ErasedRule] {
-        self.rules.get_or_init(|| {
-            match self.get_rulepack() {
-                Ok(rulepack) => rulepack.rules,
-                Err(error) => {
-                    eprintln!("Error loading rules: {}", error);
-                    std::process::exit(1);
-                }
-            }
-        })
+        self.rules.get_or_init(|| self.get_rulepack().rules)
     }
 
     pub fn formatter(&self) -> Option<&Arc<dyn Formatter>> {

crates/lib/src/core/rules/base.rs

@@ -361,26 +361,21 @@ impl RuleSet {
         &self,
         glob_list: Vec<String>,
         reference_map: &AHashMap<&'static str, AHashSet<&'static str>>,
-    ) -> Result<AHashSet<&'static str>, String> {
+    ) -> AHashSet<&'static str> {
         let mut expanded_rule_set = AHashSet::new();
 
         for r in glob_list {
             if reference_map.contains_key(r.as_str()) {
                 expanded_rule_set.extend(reference_map[r.as_str()].clone());
             } else {
-                let available_rules: Vec<&str> = reference_map.keys().copied().collect();
-                return Err(format!(
-                    "Rule '{}' not found. Available rules: {}",
-                    r,
-                    available_rules.join(", ")
-                ));
+                panic!("Rule {r} not found in rule reference map");
             }
         }
 
-        Ok(expanded_rule_set)
+        expanded_rule_set
     }
 
-    pub(crate) fn get_rulepack(&self, config: &FluffConfig) -> Result<RulePack, String> {
+    pub(crate) fn get_rulepack(&self, config: &FluffConfig) -> RulePack {
         let reference_map = self.rule_reference_map();
         let rules = config.get_section("rules");
         let keylist = self.register.keys();
@@ -402,8 +397,8 @@ impl RuleSet {
             None => Vec::new(),
         };
 
-        let expanded_allowlist = self.expand_rule_refs(allowlist, &reference_map)?;
-        let expanded_denylist = self.expand_rule_refs(denylist, &reference_map)?;
+        let expanded_allowlist = self.expand_rule_refs(allowlist, &reference_map);
+        let expanded_denylist = self.expand_rule_refs(denylist, &reference_map);
 
         let keylist: Vec<_> = keylist
             .into_iter()
@@ -425,9 +420,9 @@ impl RuleSet {
             instantiated_rules.push(rule.load_from_config(specific_rule_config).unwrap());
         }
 
-        Ok(RulePack {
+        RulePack {
             rules: instantiated_rules,
             _reference_map: reference_map,
-        })
+        }
     }
 }