Add sanity check to PyGrammar_LabelRepr() in order to catch invalid tokens when debugging

a new grammar.
CID 715360

diff --git a/Parser/grammar1.c b/Parser/grammar1.c
index 1f7d264be927e95080b02dfbf0b1417c98053fa9..17e2ba9f926b8559718e9b8c944960af74bbe8fd 100644 (file)
--- a/Parser/grammar1.c
+++ b/Parser/grammar1.c
@@ -45,7 +45,7 @@ PyGrammar_LabelRepr(label *lb)
         else
             return lb->lb_str;
     }
-    else {
+    else if (lb->lb_type < N_TOKENS) {
         if (lb->lb_str == NULL)
             return _PyParser_TokenNames[lb->lb_type];
         else {
@@ -54,4 +54,7 @@ PyGrammar_LabelRepr(label *lb)
             return buf;
         }
     }
+    else {
+        Py_FatalError("invalid label");
+    }
 }