diff -r d1ba4868296f Modules/parsermodule.c
--- a/Modules/parsermodule.c	Wed Mar 25 01:21:14 2015 +0100
+++ b/Modules/parsermodule.c	Wed Mar 25 01:27:42 2015 +0100
@@ -1098,17 +1098,20 @@ validate_repeating_list(node *tree, int 
     int res = (nch && validate_ntype(tree, ntype)
                && vfunc(CHILD(tree, 0)));
 
-    if (!res && !PyErr_Occurred())
-        (void) validate_numnodes(tree, 1, name);
-    else {
-        if (is_even(nch))
-            res = validate_comma(CHILD(tree, --nch));
-        if (res && nch > 1) {
-            int pos = 1;
-            for ( ; res && pos < nch; pos += 2)
-                res = (validate_comma(CHILD(tree, pos))
-                       && vfunc(CHILD(tree, pos + 1)));
-        }
+    if (!res) {
+        if (PyErr_Occurred())
+            return 0;
+
+        return validate_numnodes(tree, 1, name);
+    }
+
+    if (is_even(nch))
+        res = validate_comma(CHILD(tree, --nch));
+    if (res && nch > 1) {
+        int pos = 1;
+        for ( ; res && pos < nch; pos += 2)
+            res = (validate_comma(CHILD(tree, pos))
+                   && vfunc(CHILD(tree, pos + 1)));
     }
     return (res);
 }