修复了函数调用时求值类型使用的作用域错误的问题。结构体中现在可以使用自己

src/Module/Library/std/time/time.fig

@@ -43,8 +43,19 @@ public struct Time
         return result;
     }
     // TODO: support `-` operator when Fig supports overload
+    // supported now! 26-2-2. PuqiAR
 } 
 
+impl Operation for Time
+{
+    Sub(l: Time, r: Time)
+    {
+        return new Time{
+            l.since(r)
+        };
+    }
+}
+
 public func now() -> Time
 {
     return new Time{__ftime_now_ns()};