diff --git a/samples/helloworld.ks b/samples/helloworld.ks
index c2b5eef..f5b812b 100644
--- a/samples/helloworld.ks
+++ b/samples/helloworld.ks
@@ -1,14 +1,4 @@
 
 //mod samples/testmod.ks> m;
 
-class MyVec {
-  a:Buf
-  .@index_get(i): self.a[i], // 别忘了逗号
-  .@index_set(i, v) {
-    self.a[i] = v;
-  }
-}
-let a = MyVec::{a:'233'};
-let a = '233';
-a[1] = 0;
-log(a);
\ No newline at end of file
+log(8u>>3==1)
\ No newline at end of file
diff --git a/src/scan/charts.rs b/src/scan/charts.rs
index d6344e7..0201fe4 100644
--- a/src/scan/charts.rs
+++ b/src/scan/charts.rs
@@ -4,17 +4,17 @@
 pub const fn prec(x:&[u8])-> u8 {
   match x {
     b"-."|b"-:" => 16,
-    b"is"=> 15,
-    b"::"|b"." => 14,
-    b"("|b"[" => 13, // 代指调用和索引
-    // unary => 12
-    b"*" | b"%" | b"/" => 11, 
-    b"+" | b"-" => 10, 
-    b"<<"|b">>" => 9,
-    b"&" => 8,
-    b"^" => 7,
-    b"|" => 6,
-    b"=="|b"!="|b"<"|b">"|b"<="|b">=" => 5,
+    b"::"|b"." => 15,
+    b"("|b"[" => 14, // 代指调用和索引
+    // unary => 13
+    b"*" | b"%" | b"/" => 12, 
+    b"+" | b"-" => 11, 
+    b"<<"|b">>" => 10,
+    b"&" => 9,
+    b"^" => 8,
+    b"|" => 7,
+    b"=="|b"!="|b"<"|b">"|b"<="|b">=" => 6,
+    b"is"=> 5,
     b"&&" => 4,
     b"||" => 3,
     b"="|b"+="|b"-="|b"*="|b"/="|b"%="|b"&="|b"|="|b"^="|b"<<="|b">>=" => 2,
@@ -22,7 +22,7 @@ pub const fn prec(x:&[u8])-> u8 {
     _=> 0
   }
 }
-pub const PREC_UNARY:u8 = 12;
+pub const PREC_UNARY:u8 = 13;
 
 
 /// 转义符表