stage1 完成ast 定义sema

stage1/test18_match.spl

@@ -118,7 +118,7 @@ fn test_shape_match() i32 {
         .Circle[r] => {
             if r != 10 { ret 1; }
         },
-        .Rect[.x = w, .y = h] => {
+        .Rect[p] => {
             ret 2;
         }
     }
@@ -127,9 +127,9 @@ fn test_shape_match() i32 {
     s = Shape { .Rect = Point { .x = 3, .y = 4 } };
     match s {
         .Circle[r] => { ret 3; },
-        .Rect[.x = w, .y = h] => {
-            if w != 3 { ret 4; }
-            if h != 4 { ret 5; }
+        .Rect[p] => {
+            if p.x != 3 { ret 4; }
+            if p.y != 4 { ret 5; }
         }
     }