Var without initializer

samples/test.brc

@@ -1,19 +1,17 @@
-@extern putchar fun: character u32 -> u32
+//@extern putchar fun: character u32 -> u32
 
 User blob
     num1 s32
     num2 u8
 ;
 
-rawAdd raw<"=r,r,r">: num1 u32, num2 u32 -> u32
+/*rawAdd raw<"=r,r,r">: num1 u32, num2 u32 -> u32
     add $1, $2
     mov $0, $1
-;
+;*/
 
 main fun -> u32
-    n1 u32 <- 5
-    n2 u32 <- 4
-    n3 u32 <- rawAdd(n1, n2)
+    us User
 
     ret 0
 ;