Fix Expression.__bool__

diff --git a/pypol/linear.py b/pypol/linear.py
index 2c71c02d2b01fb74d24ae3cae42185c3449d3b73..749f7c365e08567d671c72626ea19a9e0fbce27a 100644 (file)
--- a/pypol/linear.py
+++ b/pypol/linear.py
@@ -135,7 +135,7 @@ class Expression:
         return False
 
     def __bool__(self):
-        True
+        return True
 
     def __pos__(self):
         return self