stop panicking in case of internal error

filter_parser/fuzz/fuzz_targets/parse.rs

@@ -1,13 +1,18 @@
 #![no_main]
-use filter_parser::FilterCondition;
+use filter_parser::{ErrorKind, FilterCondition};
 use libfuzzer_sys::fuzz_target;
 
 fuzz_target!(|data: &[u8]| {
     if let Ok(s) = std::str::from_utf8(data) {
-        // When we are fuzzing the parser we can get stack overflow really easily.
+        // When we are fuzzing the parser we can get a stack overflow very easily.
         // But since this doesn't happens with a normal build we are just going to limit the fuzzer to 500 characters.
         if s.len() < 500 {
-            let _ = FilterCondition::parse(s);
+            match FilterCondition::parse(s) {
+                Err(e) if matches!(e.kind(), ErrorKind::InternalError(_)) => {
+                    panic!("Found an internal error: `{:?}`", e)
+                }
+                _ => (),
+            }
         }
     }
 });