optimize(value): less clone

src/jit/mod.rs

@@ -289,7 +289,7 @@ impl<'vm, 'ctx: 'vm> JITContext<'ctx> {
                     .new_thunk(Rc::into_raw(Rc::new(Thunk::new(vm.get_thunk(idx))))),
             )?,
             OpCode::CaptureEnv => {
-                let thunk = *stack.tos()?;
+                let thunk = *stack.tos();
                 self.builder.build_direct_call(
                     self.helpers.capture_env,
                     &[thunk.into(), env.into()],