From d1b4f1082eaa468b8c788ad5dad21880cfd1f5e1 Mon Sep 17 00:00:00 2001
From: narimiran <narimiran@disroot.org>
Date: Wed, 29 May 2019 13:37:55 +0200
Subject: [PATCH] close #5859 by adding a test

---
 tests/iter/titer13.nim | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tests/iter/titer13.nim b/tests/iter/titer13.nim
index 716f599004d5..0d4a399c580a 100644
--- a/tests/iter/titer13.nim
+++ b/tests/iter/titer13.nim
@@ -70,3 +70,14 @@ block:
     yield 4
   for a in myIter2():
     echo a
+
+block t5859:
+  proc flatIterator[T](s: openarray[T]): auto {.noSideEffect.}=
+    result = iterator(): auto =
+      when (T is not seq|array):
+        for item in s:
+          yield item
+      else:
+        yield 123456
+  # issue #5859
+  let it = flatIterator(@[@[1,2], @[3,4]])