Fix test.

src/engine.rs

@@ -280,6 +280,7 @@ impl Engine {
                 Some(Box::new(crate::module::resolvers::FileModuleResolver::new()));
         }
 
+        // Turn on the strings interner
         engine.set_max_strings_interned(MAX_STRINGS_INTERNED);
 
         // default print/debug implementations
@@ -297,6 +298,7 @@ impl Engine {
             }));
         }
 
+        // Register the standard package
         engine.register_global_module(StandardPackage::new().as_shared_module());
 
         engine

src/parser.rs

@@ -1474,18 +1474,14 @@ impl Engine {
             #[cfg(not(feature = "no_function"))]
             Token::Pipe | Token::Or if settings.has_option(LangOptions::ANON_FN) => {
                 // Build new parse state
-                let new_interner = None;
                 let new_state = &mut ParseState::new(
                     state.external_constants,
-                    new_interner,
+                    state.interned_strings.as_deref_mut(),
                     state.input,
                     state.tokenizer_control.clone(),
                     state.lib,
                 );
 
-                // We move the strings interner to the new parse state object by swapping it...
-                std::mem::swap(&mut state.interned_strings, &mut new_state.interned_strings);
-
                 #[cfg(not(feature = "no_module"))]
                 {
                     // Do not allow storing an index to a globally-imported module
@@ -1518,9 +1514,6 @@ impl Engine {
 
                 let result = self.parse_anon_fn(new_state, new_settings.level_up()?);
 
-                // Restore the strings interner by swapping it back
-                std::mem::swap(&mut state.interned_strings, &mut new_state.interned_strings);
-
                 let (expr, fn_def, _externals) = result?;
 
                 #[cfg(not(feature = "no_closure"))]

tests/closures.rs

@@ -192,8 +192,11 @@ fn test_closures() {
         42
     );
 
-    let x = engine.eval::<Dynamic>("let x = #{}; x.a = || x; x").unwrap();
-    println!("{x:?}");
+    #[cfg(not(feature = "unchecked"))]
+    {
+        let x = engine.eval::<Dynamic>("let x = #{}; x.a = || x; x").unwrap();
+        println!("{x:?}");
+    }
 }
 
 #[test]