diff --git a/nac3standalone/demo/interpret_demo.py b/nac3standalone/demo/interpret_demo.py
index d892833..71bb426 100755
--- a/nac3standalone/demo/interpret_demo.py
+++ b/nac3standalone/demo/interpret_demo.py
@@ -8,6 +8,38 @@ import pathlib
 from numpy import int32, int64, uint32, uint64
 from typing import TypeVar, Generic
 
+T = TypeVar('T')
+class Option(Generic[T]):
+    _nac3_option: T
+
+    def __init__(self, v: T):
+        self._nac3_option = v
+
+    def is_none(self):
+        return self._nac3_option is None
+    
+    def is_some(self):
+        return not self.is_none()
+    
+    def unwrap(self):
+        return self._nac3_option
+
+    def __repr__(self) -> str:
+        if self.is_none():
+            return "none"
+        else:
+            return "Some({})".format(repr(self._nac3_option))
+    
+    def __str__(self) -> str:
+        if self.is_none():
+            return "none"
+        else:
+            return "Some({})".format(str(self._nac3_option))
+
+def Some(v: T) -> Option[T]:
+    return Option(v)
+
+none = Option(None)
 
 def patch(module):
     def output_asciiart(x):
@@ -39,6 +71,9 @@ def patch(module):
     module.TypeVar = TypeVar
     module.Generic = Generic
     module.extern = extern
+    module.Option = Option
+    module.Some = Some
+    module.none = none
 
 
 def file_import(filename, prefix="file_import_"):
diff --git a/nac3standalone/demo/src/option.py b/nac3standalone/demo/src/option.py
new file mode 100644
index 0000000..8cc0d5a
--- /dev/null
+++ b/nac3standalone/demo/src/option.py
@@ -0,0 +1,40 @@
+@extern
+def output_int32(x: int32):
+    ...
+
+class A:
+    d: Option[int32]
+    e: Option[Option[int32]]
+    def __init__(self, a: Option[int32], b: Option[Option[int32]]):
+        self.d = a
+        self.e = b
+
+def run() -> int32:
+    a = Some(3)
+    if a.is_some():
+        d = a.unwrap()
+        output_int32(a.unwrap())
+        a = none
+        if a.is_none():
+            output_int32(d + 2)
+    else:
+        a = Some(5)
+        c = Some(6)
+        output_int32(a.unwrap() + c.unwrap())
+
+    f = Some(4.3)
+    output_int32(int32(f.unwrap()))
+
+    obj = A(Some(6), none)
+    output_int32(obj.d.unwrap())
+
+    obj2 = Some(A(Some(7), none))
+    output_int32(obj2.unwrap().d.unwrap())
+
+    obj3 = Some(A(Some(8), Some(none)))
+    if obj3.unwrap().e.unwrap().is_none():
+        obj3.unwrap().e = Some(Some(9))
+    output_int32(obj3.unwrap().d.unwrap())
+    output_int32(obj3.unwrap().e.unwrap().unwrap())
+
+    return 0