stage1 重构测试且成功00-05

stage1/test15_defer.spl

@@ -0,0 +1,39 @@
+/* ===== 模块7：高级特性 =====
+ * test15_defer — 延迟执行
+ * 难度：3/5
+ * 验证点：defer 语句、defer 块、多个 defer（逆序执行）、
+ *         函数中 defer、块作用域 defer
+ */
+#[extern("vm")] fn vm_printf(fmt: *u8, ...) void;
+
+fn with_cleanup() void {
+    defer vm_printf("  inner defer\n");
+    vm_printf("  inside with_cleanup\n");
+}
+
+fn main() i32 {
+    vm_printf("--- defer test ---\n");
+
+    /* defer 语句 */
+    defer vm_printf("defer1\n");
+    vm_printf("after defer1\n");
+
+    /* defer 块 */
+    defer {
+        vm_printf("defer block\n");
+    }
+    vm_printf("after defer block\n");
+
+    /* 函数内 defer */
+    with_cleanup();
+    vm_printf("after with_cleanup\n");
+
+    /* 多个 defer 应逆序执行 */
+    defer vm_printf("defer last\n");
+    defer vm_printf("defer middle\n");
+    defer vm_printf("defer first (should print third)\n");
+
+    vm_printf("--- defer test end ---\n");
+
+    ret 0;
+}