From ff8e35b42ec9fbf2ab18d777a232b953ccd1f14c Mon Sep 17 00:00:00 2001
From: Paul Sokolovsky <pfalcon@users.sourceforge.net>
Date: Sun, 4 Jan 2015 13:23:44 +0200
Subject: [PATCH] objstr: Common subexpression elimination for
 vstr_str(field_name).

---
 py/objstr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/py/objstr.c b/py/objstr.c
index 8d05ae8c9f..688988c019 100644
--- a/py/objstr.c
+++ b/py/objstr.c
@@ -944,7 +944,7 @@ mp_obj_t mp_obj_str_format(mp_uint_t n_args, const mp_obj_t *args, mp_map_t *kwa
                             "can't switch from automatic field numbering to manual field specification"));
                     }
                 }
-                lookup = str_to_int(vstr_str(field_name), &index) + field;
+                lookup = str_to_int(field, &index) + field;
                 if (index >= n_args - 1) {
                     nlr_raise(mp_obj_new_exception_msg(&mp_type_IndexError, "tuple index out of range"));
                 }