From ef19788dd36124b67999ffa807c82523a50e5f72 Mon Sep 17 00:00:00 2001
From: David Beazley <dave@dabeaz.com>
Date: Fri, 16 Sep 2016 09:41:15 -0500
Subject: [PATCH] Added feature to automatically make concrete syntax tree if
 production is returned

---
 sly/yacc.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sly/yacc.py b/sly/yacc.py
index 6f9e894..153747b 100644
--- a/sly/yacc.py
+++ b/sly/yacc.py
@@ -1888,7 +1888,10 @@ class Parser(metaclass=ParserMeta):
 
                     sym = YaccSymbol()
                     sym.type = pname       
-                    sym.value = p.func(self, pslice)
+                    value = p.func(self, pslice)
+                    if value is pslice:
+                        value = (pname, *(s.value for s in pslice._slice))
+                    sym.value = value
                     if plen:
                         del symstack[-plen:]
                         del statestack[-plen:]