From 4f03613651b3b957254ada89de3ebe4637921bcc Mon Sep 17 00:00:00 2001
From: Timothee Cour <timothee.cour2@gmail.com>
Date: Wed, 11 Jul 2018 19:05:06 -0700
Subject: [PATCH] fix issue #8251 ospaths.isAbsolute: out of bound errors

---
 lib/pure/ospaths.nim | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/lib/pure/ospaths.nim b/lib/pure/ospaths.nim
index 305052e41913a..584bfb0cc673c 100644
--- a/lib/pure/ospaths.nim
+++ b/lib/pure/ospaths.nim
@@ -423,12 +423,22 @@ proc isAbsolute*(path: string): bool {.rtl, noSideEffect, extern: "nos$1".} =
   ## Checks whether a given `path` is absolute.
   ##
   ## On Windows, network paths are considered absolute too.
+  runnableExamples:
+    doAssert "".isAbsolute.not
+    doAssert nil.isAbsolute.not
+    doAssert ".".isAbsolute.not
+    when defined(posix):
+      doAssert "/".isAbsolute
+      doAssert "a/".isAbsolute.not
+
+  if len(path) == 0: return false
+
   when doslikeFileSystem:
     var len = len(path)
-    result = (len > 0 and path[0] in {'/', '\\'}) or
+    result = (path[0] in {'/', '\\'}) or
               (len > 1 and path[0] in {'a'..'z', 'A'..'Z'} and path[1] == ':')
   elif defined(macos):
-    result = path.len > 0 and path[0] != ':'
+    result = path[0] != ':'
   elif defined(RISCOS):
     result = path[0] == '$'
   elif defined(posix):