From 26d998cfdd1f843a154e5398d09c0270fa17aa30 Mon Sep 17 00:00:00 2001
From: Benjamin Peterson <benjamin@python.org>
Date: Sun, 18 Sep 2016 23:41:11 -0700
Subject: [PATCH] properly handle the single null-byte file (closes #24022)

---
 Parser/tokenizer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Parser/tokenizer.c b/Parser/tokenizer.c
index 1540d26d8b3..1a8cf40c2ce 100644
--- a/Parser/tokenizer.c
+++ b/Parser/tokenizer.c
@@ -1014,7 +1014,7 @@ tok_nextc(struct tok_state *tok)
                 else {
                     tok->done = E_OK;
                     tok->inp = strchr(tok->buf, '\0');
-                    done = tok->inp[-1] == '\n';
+                    done = tok->inp == tok->buf || tok->inp[-1] == '\n';
                 }
             }
             else {