From e213b120ab1ba4f1e6a4e50d9972a9a412ba6cdb Mon Sep 17 00:00:00 2001
From: Yuriy Glukhov <yuriy.glukhov@gmail.com>
Date: Tue, 28 Feb 2017 17:23:25 +0200
Subject: [PATCH] Fixes #5452

---
 compiler/ccgutils.nim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/compiler/ccgutils.nim b/compiler/ccgutils.nim
index 46a9177ad9..ff8f768bd3 100644
--- a/compiler/ccgutils.nim
+++ b/compiler/ccgutils.nim
@@ -181,7 +181,7 @@ proc mangle*(name: string): string =
     of '_':
       # we generate names like 'foo_9' for scope disambiguations and so
       # disallow this here:
-      if i < name.len-1 and name[i+1] in Digits:
+      if i > 0 and i < name.len-1 and name[i+1] in Digits:
         discard
       else:
         add(result, c)