pythoncapi
diff --git a/‎Parser/grammar1.c‎
Lines changed: 4 additions & 1 deletion b/‎Parser/grammar1.c‎
Lines changed: 4 additions & 1 deletion
@@ -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");
+    }
 }
Original file line number	Diff line number	Diff line change
`@@ -45,7 +45,7 @@ PyGrammar_LabelRepr(label *lb)`
`45`	`45`	`else`
`46`	`46`	`return lb->lb_str;`
`47`	`47`	`}`
`48`		`- else {`
	`48`	`+ else if (lb->lb_type < N_TOKENS) {`
`49`	`49`	`if (lb->lb_str == NULL)`
`50`	`50`	`return _PyParser_TokenNames[lb->lb_type];`
`51`	`51`	`else {`
`@@ -54,4 +54,7 @@ PyGrammar_LabelRepr(label *lb)`
`54`	`54`	`return buf;`
`55`	`55`	`}`
`56`	`56`	`}`
	`57`	`+ else {`
	`58`	`+ Py_FatalError("invalid label");`
	`59`	`+ }`
`57`	`60`	`}`