diff --git a/src/Examples.java b/src/Examples.java
index 3cd7728..71e79d9 100644
--- a/src/Examples.java
+++ b/src/Examples.java
@@ -1,4 +1,4 @@
-import generator.Gen;
+import generator.gen.Gen;
 
 public class Examples {
     //    public static Gen<String, Void> parse(String str){
diff --git a/src/Lexer.java b/src/Lexer.java
index 82a066b..9bc3787 100644
--- a/src/Lexer.java
+++ b/src/Lexer.java
@@ -1,4 +1,4 @@
-import generator.Gen;
+import generator.gen.Gen;
 
 public class Lexer {
     public sealed interface Token{}
diff --git a/src/Main.java b/src/Main.java
index 4f46b88..440d093 100644
--- a/src/Main.java
+++ b/src/Main.java
@@ -1,5 +1,5 @@
 import generator.Fun;
-import generator.Gen;
+import generator.gen.Gen;
 
 public class Main implements Runnable {
     public static void main(String[] args) {
diff --git a/src/generator/future/Future.java b/src/generator/future/Future.java
new file mode 100644
index 0000000..d1c2c06
--- /dev/null
+++ b/src/generator/future/Future.java
@@ -0,0 +1,18 @@
+package generator.future;
+
+public interface Future<R> {
+
+    @SuppressWarnings("unchecked")
+    default R poll(Waker waker){
+        return (R) Pending.INSTANCE;
+    }
+
+    default R await(){
+        throw new RuntimeException();
+    }
+
+    final class Pending{
+        private static final Pending INSTANCE = new Pending();
+        private Pending(){}
+    }
+}
diff --git a/src/generator/future/Waker.java b/src/generator/future/Waker.java
new file mode 100644
index 0000000..f525dcd
--- /dev/null
+++ b/src/generator/future/Waker.java
@@ -0,0 +1,5 @@
+package generator.future;
+
+public interface Waker {
+    void wake();
+}
diff --git a/src/generator/Gen.java b/src/generator/gen/Gen.java
similarity index 96%
rename from src/generator/Gen.java
rename to src/generator/gen/Gen.java
index e3d53ba..18c4104 100644
--- a/src/generator/Gen.java
+++ b/src/generator/gen/Gen.java
@@ -1,4 +1,4 @@
-package generator;
+package generator.gen;
 
 public interface Gen<Y, R> {
     Res<Y, R> next();
diff --git a/src/generator/runtime/GeneratorBuilder.java b/src/generator/runtime/GeneratorBuilder.java
index 0938771..287b232 100644
--- a/src/generator/runtime/GeneratorBuilder.java
+++ b/src/generator/runtime/GeneratorBuilder.java
@@ -1,6 +1,6 @@
 package generator.runtime;
 
-import generator.Gen;
+import generator.gen.Gen;
 
 import java.lang.classfile.*;
 import java.lang.classfile.attribute.InnerClassInfo;
diff --git a/src/generator/runtime/GeneratorClassLoader.java b/src/generator/runtime/GeneratorClassLoader.java
index 1d0e3f0..c7c9ee5 100644
--- a/src/generator/runtime/GeneratorClassLoader.java
+++ b/src/generator/runtime/GeneratorClassLoader.java
@@ -1,7 +1,7 @@
 package generator.runtime;
 
 import generator.Fun;
-import generator.Gen;
+import generator.gen.Gen;
 
 import java.io.IOException;
 import java.lang.classfile.*;