From 68f497c962a5c9468f78eed0a78d10b5bb1c3354 Mon Sep 17 00:00:00 2001
From: Nick Fitzgerald <fitzgen@gmail.com>
Date: Tue, 1 Nov 2016 11:25:15 -0700
Subject: Avoid an extra lookup when finding new whitelisted items to traverse

---
 src/ir/context.rs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/ir/context.rs b/src/ir/context.rs
index 7e824be1..6c56eefe 100644
--- a/src/ir/context.rs
+++ b/src/ir/context.rs
@@ -922,9 +922,8 @@ impl<'ctx, 'gen> Iterator for WhitelistedItemsIter<'ctx, 'gen>
         id.collect_types(self.ctx, &mut sub_types, &());
 
         for id in sub_types {
-            if !self.seen.contains(&id) {
+            if self.seen.insert(id) {
                 self.to_iterate.push(id);
-                self.seen.insert(id);
             }
         }
 
-- 
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