From 99425ff21dc758c8cb9abc3ddbe44ed2025906f0 Mon Sep 17 00:00:00 2001
From: Araq <rumpf_a@web.de>
Date: Wed, 11 Sep 2019 11:59:12 +0200
Subject: [PATCH] fixes #12174

---
 compiler/astalgo.nim | 1 +
 1 file changed, 1 insertion(+)

diff --git a/compiler/astalgo.nim b/compiler/astalgo.nim
index cfa1a67fdb..0efa096be5 100644
--- a/compiler/astalgo.nim
+++ b/compiler/astalgo.nim
@@ -194,6 +194,7 @@ proc sameIgnoreBacktickGensymInfo(a, b: string): bool =
   if a[0] != b[0]: return false
   var last = a.len - 1
   while last > 0 and a[last] != '`': dec(last)
+  if last == 0: last = a.len - 1
 
   var i = 1
   var j = 1