fix: eval 数组输出改读元素区

crates/oxide_cli/src/main.rs

@@ -286,7 +286,8 @@ fn format_object(
 fn format_array(
     vm: &oxide_vm::vm::Vm, string_forge: &PermInterner, shape_forge: &ShapeForge, obj: &JsObject,
 ) -> String {
-    let len = obj.prop_vec_len();
+    // 数组元素在独立元素区，命名属性区长度恒 0；元素区未分配时 get_prop_at 自然返回 undefined。
+    let len = obj.array_prop_count as usize;
     let mut items = Vec::new();
     for i in 0..len {
         let val = obj.get_prop_at(i);

crates/oxide_cli/tests/cli_smoke.rs

@@ -51,6 +51,18 @@ fn run_throw_script() {
     assert!(!stderr.is_empty(), "run 失败应输出 stderr: {stderr}");
 }
 
+#[test]
+fn eval_array_output() {
+    let output = Command::new(env!("CARGO_BIN_EXE_oxide"))
+        .args(["eval", "var a = [1, 2, 3]; a"])
+        .output()
+        .expect("failed to run oxide eval array");
+
+    assert!(output.status.success(), "eval array should exit 0");
+    let stdout = String::from_utf8_lossy(&output.stdout);
+    assert!(stdout.trim() == "[1, 2, 3]", "eval 数组应打印元素区内容: {stdout}");
+}
+
 #[test]
 fn bench_help() {
     let output = Command::new(env!("CARGO_BIN_EXE_oxide"))