1 files changed, 7 insertions, 0 deletions
diff --git a/tvix/eval/src/compiler/mod.rs b/tvix/eval/src/compiler/mod.rs
index 69c232926b41..80e1cd27c953 100644
--- a/tvix/eval/src/compiler/mod.rs
+++ b/tvix/eval/src/compiler/mod.rs
@@ -1021,6 +1021,12 @@ impl Compiler<'_> {
         // lambda as a constant.
         let mut compiled = self.contexts.pop().unwrap();
 
+        // Emit an instruction to inform the VM that the chunk has ended.
+        compiled
+            .lambda
+            .chunk
+            .push_op(OpCode::OpReturn, self.span_for(node));
+
         // Capturing the with stack counts as an upvalue, as it is
         // emitted as an upvalue data instruction.
         if compiled.captures_with_stack {
@@ -1433,6 +1439,7 @@ pub fn compile(
     // unevaluated state (though in practice, a value *containing* a
     // thunk might be returned).
     c.emit_force(expr);
+    c.push_op(OpCode::OpReturn, &root_span);
 
     let lambda = Rc::new(c.contexts.pop().unwrap().lambda);
     c.observer.observe_compiled_toplevel(&lambda);