diff --git a/native/src/opcodes.rs b/native/src/opcodes.rs
index ddbdb1d..1851c80 100644
--- a/native/src/opcodes.rs
+++ b/native/src/opcodes.rs
@@ -1,6 +1,6 @@
 use std::fmt;
 
-#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
+#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug)]
 #[repr(transparent)]
 pub struct Reg(pub u16);
 
@@ -16,11 +16,11 @@ pub struct ConstIdx(pub u16);
 
 impl fmt::Display for ConstIdx {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "({})", self.0)
+        write!(f, "K{}", self.0)
     }
 }
 
-#[derive(Copy, Clone, Eq, PartialEq)]
+#[derive(Copy, Clone, Eq, PartialEq, Debug)]
 pub enum ArgV {
     R(Reg),
     K(ConstIdx),
@@ -35,7 +35,7 @@ impl fmt::Display for ArgV {
     }
 }
 
-#[derive(Copy, Clone, Eq, PartialEq)]
+#[derive(Copy, Clone, Eq, PartialEq, Debug)]
 pub enum ArgL {
     SubI(Reg, i16),
     SubR(Reg, Reg),
@@ -50,11 +50,11 @@ impl fmt::Display for ArgL {
     }
 }
 
-#[derive(Copy, Clone, Eq, PartialEq)]
+#[derive(Copy, Clone, Eq, PartialEq, Debug)]
 pub enum Ins {
-    O(InsO, i32),
     V(InsV, ArgV),
     RV(InsRV, Reg, ArgV),
+    O(InsO, i32),
     RL(InsRL, Reg, ArgL),
     LV(InsLV, ArgL, ArgV),
     RRK(InsRRK, Reg, Reg, ConstIdx),
@@ -77,40 +77,40 @@ impl fmt::Display for Ins {
     }
 }
 
-#[derive(Copy, Clone, Eq, PartialEq)]
+#[derive(Copy, Clone, Eq, PartialEq, Debug)]
 pub enum InsV {
     RET,
     BTR,
 }
 
-#[derive(Copy, Clone, Eq, PartialEq)]
+#[derive(Copy, Clone, Eq, PartialEq, Debug)]
 pub enum InsRV {
     Op(Opr),
     Br(Cmp),
 }
 
-#[derive(Copy, Clone, Eq, PartialEq)]
+#[derive(Copy, Clone, Eq, PartialEq, Debug)]
+pub enum InsO {
+    JMP,
+}
+
+#[derive(Copy, Clone, Eq, PartialEq, Debug)]
 pub enum InsRL {
     Get(Opr),
     CAL(u16),
     RETCAL(u16),
 }
 
-#[derive(Copy, Clone, Eq, PartialEq)]
+#[derive(Copy, Clone, Eq, PartialEq, Debug)]
 pub enum InsLV {
     Set(Opr),
 }
 
-#[derive(Copy, Clone, Eq, PartialEq)]
+#[derive(Copy, Clone, Eq, PartialEq, Debug)]
 pub enum InsRRK {
     LOC,
 }
 
-#[derive(Copy, Clone, Eq, PartialEq)]
-pub enum InsO {
-    JMP,
-}
-
 #[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug)]
 pub enum Opr {
     MOV,