diff --git a/src/Lexer.java b/src/Lexer.java
index 8d003e3..82a066b 100644
--- a/src/Lexer.java
+++ b/src/Lexer.java
@@ -1,8 +1,6 @@
 import generator.Gen;
 
 public class Lexer {
-
-
     public sealed interface Token{}
     public enum Punc implements Token {
         LPar,
diff --git a/src/Main.java b/src/Main.java
index 61f29d0..4f46b88 100644
--- a/src/Main.java
+++ b/src/Main.java
@@ -8,8 +8,8 @@ public class Main implements Runnable {
 
     @Override
     public void run() {
-        await();
-//        lexer();
+//        await();
+        lexer();
     }
 
     void await(){
diff --git a/src/generator/runtime/GeneratorBuilder.java b/src/generator/runtime/GeneratorBuilder.java
index b257ed6..5dd39a4 100644
--- a/src/generator/runtime/GeneratorBuilder.java
+++ b/src/generator/runtime/GeneratorBuilder.java
@@ -3,10 +3,17 @@ package generator.runtime;
 import generator.Gen;
 
 import java.lang.classfile.*;
+import java.lang.classfile.attribute.StackMapFrameInfo;
+import java.lang.classfile.instruction.*;
 import java.lang.constant.ClassDesc;
 import java.lang.constant.ConstantDescs;
 import java.lang.constant.MethodTypeDesc;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+
+import static java.lang.classfile.attribute.StackMapFrameInfo.SimpleVerificationTypeInfo.TOP;
 
 public class GeneratorBuilder {
     public final static String PARAM_PREFIX = "param_";
@@ -21,7 +28,7 @@ public class GeneratorBuilder {
     public final static MethodTypeDesc MTD_Res = MethodTypeDesc.of(CD_Res);
     public final static MethodTypeDesc MTD_Gen_Obj = MethodTypeDesc.of(CD_Gen, ConstantDescs.CD_Object);
     public final static MethodTypeDesc MTD_Gen = MethodTypeDesc.of(CD_Gen);
-    public static MethodTypeDesc MTD_Obj = MethodTypeDesc.of(ConstantDescs.CD_Object);
+    public final static MethodTypeDesc MTD_Obj = MethodTypeDesc.of(ConstantDescs.CD_Object);
 
     public final String name;
     public final ClassDesc CD_this_gen;
@@ -58,7 +65,7 @@ public class GeneratorBuilder {
     }
 
     public byte[] buildGenerator(CodeModel com){
-        return ClassFile.of(ClassFile.StackMapsOption.STACK_MAPS_WHEN_REQUIRED, ClassFile.DebugElementsOption.PASS_DEBUG, ClassFile.LineNumbersOption.PASS_LINE_NUMBERS, ClassFile.AttributesProcessingOption.PASS_ALL_ATTRIBUTES).build(CD_this_gen, clb -> {
+        return ClassFile.of(ClassFile.StackMapsOption.STACK_MAPS_WHEN_REQUIRED).build(CD_this_gen, clb -> {
             clb.withInterfaces(List.of(clb.constantPool().classEntry(CD_Gen)));
             // parameter fields
             params(0, (param, _, type) -> {