From 76d658b1936d50666c07d435d1ad63e19ee9dfc9 Mon Sep 17 00:00:00 2001
From: Bryan Boreham <bjboreham@gmail.com>
Date: Tue, 7 Jul 2015 22:15:07 +0100
Subject: [PATCH] Make MakeIDList() enforce invariant

---
 report/id_list.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/report/id_list.go b/report/id_list.go
index 9d89d7d08..29d8b4f48 100644
--- a/report/id_list.go
+++ b/report/id_list.go
@@ -8,6 +8,12 @@ type IDList []string
 // MakeIDList makes a new IDList.
 func MakeIDList(ids ...string) IDList {
 	sort.Strings(ids)
+	for i := 1; i < len(ids); i++ { // shuffle down any duplicates
+		if ids[i-1] == ids[i] {
+			ids = append(ids[:i-1], ids[i:]...)
+			i--
+		}
+	}
 	return IDList(ids)
 }