1 files changed, 8 insertions, 0 deletions
diff --git a/py/runtime.c b/py/runtime.c
index 91ead1fba..c0a4f44a1 100644
--- a/py/runtime.c
+++ b/py/runtime.c
@@ -1546,6 +1546,14 @@ NORETURN void mp_raise_IndexError(const compressed_string_t *msg) {
     mp_raise_msg(&mp_type_IndexError, msg);
 }
 
+NORETURN void mp_raise_IndexError_varg(const compressed_string_t *fmt, ...) {
+    va_list argptr;
+    va_start(argptr,fmt);
+    mp_obj_t exception = mp_obj_new_exception_msg_vlist(&mp_type_IndexError, fmt, argptr);
+    va_end(argptr);
+    nlr_raise(exception);
+}
+
 NORETURN void mp_raise_ValueError(const compressed_string_t *msg) {
     mp_raise_msg(&mp_type_ValueError, msg);
 }