From 0c6c4be0e783893cc21352fa686fb18c158d3e43 Mon Sep 17 00:00:00 2001
From: flywind <43030857+xflywind@users.noreply.github.com>
Date: Tue, 24 Nov 2020 02:23:52 +0800
Subject: fix ropes format errors (#16106) [backport:1.0]

* fix rope index

* add testcase

* fix ropes format
---
 lib/pure/ropes.nim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'lib/pure/ropes.nim')

diff --git a/lib/pure/ropes.nim b/lib/pure/ropes.nim
index 0797bbe06..a39533e58 100644
--- a/lib/pure/ropes.nim
+++ b/lib/pure/ropes.nim
@@ -262,7 +262,7 @@ proc `%`*(frmt: string, args: openArray[Rope]): Rope {.
         while true:
           j = j * 10 + ord(frmt[i]) - ord('0')
           inc(i)
-          if frmt[i] notin {'0'..'9'}: break
+          if i >= frmt.len or frmt[i] notin {'0'..'9'}: break
         add(result, args[j-1])
       of '{':
         inc(i)
-- 
cgit 1.4.1-2-gfad0