修复了大量存在的问题，增加了假鸭子类型等等机制

includes/testcheck.py

@@ -0,0 +1,54 @@
+# testcheck - 回归测试格式化输出库
+# 提供 PASS/FAIL 计数、分节标题、汇总报告
+import t, c
+import stdio
+
+_pass_count: t.CInt = 0
+_fail_count: t.CInt = 0
+
+
+def begin(name: str):
+    """开始测试套件，打印头部并重置计数器"""
+    global _pass_count, _fail_count
+    _pass_count = 0
+    _fail_count = 0
+    stdio.printf("=== %s ===\n\n", name)
+
+
+def section(name: str):
+    """打印分节标题"""
+    stdio.printf("--- %s ---\n", name)
+
+
+def ok(msg: str):
+    """打印 PASS 并计数"""
+    global _pass_count
+    _pass_count += 1
+    stdio.printf("PASS: %s\n", msg)
+
+
+def fail(msg: str):
+    """打印 FAIL 并计数"""
+    global _fail_count
+    _fail_count += 1
+    stdio.printf("FAIL: %s\n", msg)
+
+
+def check(cond: t.CInt, ok_msg: str, fail_msg: str):
+    """条件检查，自动选择 PASS/FAIL"""
+    if cond:
+        ok(ok_msg)
+    else:
+        fail(fail_msg)
+
+
+def info(msg: str):
+    """打印信息消息（不计入 PASS/FAIL）"""
+    stdio.printf("%s\n", msg)
+
+
+def end() -> t.CInt:
+    """打印汇总，返回失败数"""
+    stdio.printf("\n--- Summary ---\n")
+    stdio.printf("PASS: %d, FAIL: %d\n", _pass_count, _fail_count)
+    return _fail_count