Fixed Issue #14.

2018-09-08 15:26:00 -05:00
parent a33ff221e5
commit 6a27431f81
2 changed files with 4 additions and 1 deletions
--- a/sly/yacc.py
+++ b/sly/yacc.py
@@ -139,7 +139,7 @@ class YaccProduction:
            if isinstance(tok, YaccSymbol):
                continue
            index = getattr(tok, 'index', None)
-            if index:
+            if index is not None:
                return index
        raise AttributeError('No index attribute found')