return nil (empty list) if there's nothing else to return

1 files changed, 7 insertions, 0 deletions

diff --git a/tokens.py b/tokens.py
index 1f1fe1b..6e4ba86 100644
--- a/tokens.py
+++ b/tokens.py
@@ -140,3 +140,10 @@ class NebList(NebAny):
             out += f"{item} "
         return f"{out}]"
 
+class NebNil(NebList):
+    def __init__(self):
+        super().__init__([])
+
+    def __str__(self):
+        return "()"
+