stage1 完成ast 定义sema

stage1/test16_methods.spl

@@ -24,8 +24,8 @@ type Expr = enum {
 
     fn eval(self: *Expr) i32 {
         match self {
-            .Int[val] => ret val,
-            .Add[.left = left, .right = right] => ret eval(left) + eval(right),
+            .Int[val] => { ret val; },
+            .Add[sub] => { ret eval(sub.left) + eval(sub.right); }
         }
         ret 0;
     }
@@ -39,7 +39,7 @@ fn main() i32 {
     /* enum 方法 + match */
     var expr_l := Expr { .Int = 3 };
     var expr_r := Expr { .Int = 4 };
-    var expr := Expr { .Add = { .left = expr_l, .right = expr_r } };
+    var expr := Expr { .Add = .{ .left = expr_l, .right = expr_r } };
     var result := expr.eval(&expr);
     vm_printf("eval result: %d\n", result);
     if result != 7 { ret 1; }