fixes from kmod's comments

from_cpython/Objects/iterobject.c

@@ -66,7 +66,7 @@ calliter_next(calliterobject *it)
                 Py_CLEAR(it->it_sentinel);
             }
         }
-        else if (PyErr_ExceptionMatches(PyExc_StopIteration) || PyErr_ExceptionMatches(PyExc_IndexError)) {
+        else if (PyErr_ExceptionMatches(PyExc_StopIteration)) {
             PyErr_Clear();
             Py_CLEAR(it->it_callable);
             Py_CLEAR(it->it_sentinel);

src/runtime/inline/list.cpp

@@ -40,7 +40,7 @@ Box* listiterHasnext(Box* s) {
     BoxedListIterator* self = static_cast<BoxedListIterator*>(s);
 
     if (!self->l) {
-        raiseExcHelper(StopIteration, "");
+        return False;
     }
 
     bool ans = (self->pos < self->l->size);
@@ -55,7 +55,7 @@ i1 listiterHasnextUnboxed(Box* s) {
     BoxedListIterator* self = static_cast<BoxedListIterator*>(s);
 
     if (!self->l) {
-        raiseExcHelper(StopIteration, "");
+        return false;
     }
 
     bool ans = (self->pos < self->l->size);