From a8b0b90c6f883cfc5d88bf6713e11aa4139bae3c Mon Sep 17 00:00:00 2001
From: Rachel Fenichel <fenichel@google.com>
Date: Mon, 19 Nov 2018 12:55:04 -0800
Subject: [PATCH] Add warning for default case in canConnectToPrevious_

---
 core/connection.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/connection.js b/core/connection.js
index e01063939..9c60ea98b 100644
--- a/core/connection.js
+++ b/core/connection.js
@@ -380,7 +380,7 @@ Blockly.Connection.prototype.canConnectToPrevious_ = function(candidate) {
     // marker is in the middle of a stack, it won't work.
     return !targetBlock.getPreviousBlock();
   }
-  // ???
+  console.warn('Returning false by default from canConnectToPrevious_.');
   return false;
 };