From 1f61dd15765a31c19c0b0932dadd80322c0e5fed Mon Sep 17 00:00:00 2001
From: Adlai Holler <guy.on.internet@me.com>
Date: Fri, 2 Sep 2016 09:19:11 -0700
Subject: [PATCH] Log update validation exception messages before throwing, so
 user can see them before they bubble up (#2180)

---
 AsyncDisplayKit/Private/_ASHierarchyChangeSet.mm | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/AsyncDisplayKit/Private/_ASHierarchyChangeSet.mm b/AsyncDisplayKit/Private/_ASHierarchyChangeSet.mm
index 649f39e8c3..db6f41a79f 100644
--- a/AsyncDisplayKit/Private/_ASHierarchyChangeSet.mm
+++ b/AsyncDisplayKit/Private/_ASHierarchyChangeSet.mm
@@ -18,10 +18,12 @@
 
 #import <unordered_map>
 
+// NOTE: We log before throwing so they don't have to let it bubble up to see the error.
 #define ASFailUpdateValidation(...)\
   if ([ASDisplayNode suppressesInvalidCollectionUpdateExceptions]) {\
     NSLog(__VA_ARGS__);\
   } else {\
+    NSLog(__VA_ARGS__);\
     ASDisplayNodeFailAssert(__VA_ARGS__);\
   }