-instance If ByteCode Stmt Stmt Stmt
-instance If ByteCode Stmt e Stmt
-instance If ByteCode Stmt Stmt e
-instance If ByteCode x y Expr
+instance userLed ByteCode
+//instance If ByteCode Stmt Stmt Stmt
+//instance If ByteCode e Stmt Stmt
+//instance If ByteCode Stmt e Stmt
+instance If ByteCode x y Stmt