From 1428aeccfb38170f4580eb3153d2e9f3d91c6756 Mon Sep 17 00:00:00 2001
From: Araq <rumpf_a@web.de>
Date: Wed, 3 Oct 2018 00:08:45 +0200
Subject: [PATCH] closes #5868

---
 tests/concepts/tusertypeclasses.nim | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/tests/concepts/tusertypeclasses.nim b/tests/concepts/tusertypeclasses.nim
index 3ea10569f1..c7104f2a6c 100644
--- a/tests/concepts/tusertypeclasses.nim
+++ b/tests/concepts/tusertypeclasses.nim
@@ -5,6 +5,7 @@ Container
 TObj
 int
 111 111
+(id: @[1, 2, 3], name: @["Vas", "Pas", "NafNaf"], age: @[10, 16, 18])
 '''
 """
 
@@ -107,3 +108,21 @@ let usedToFail: stringTest = "111"
 let working: string = "111"
 
 echo usedToFail, " ", working
+
+# bug #5868
+
+type TaggedType[T; Key: static[string]] = T
+
+proc setKey*[DT](dt: DT, key: static[string]): TaggedType[DT, key] =
+  result = cast[type(result)](dt)
+
+type Students = object
+   id : seq[int]
+   name : seq[string]
+   age: seq[int]
+
+let
+  stud = Students(id : @[1,2,3], name : @["Vas", "Pas", "NafNaf"], age : @[10,16,18])
+  stud2 = stud.setkey("id")
+
+echo stud2