From 75e06de477ff9770896139b29729d9c28a5dd294 Mon Sep 17 00:00:00 2001
From: Rachel Fenichel <fenichel@google.com>
Date: Wed, 13 Jul 2016 12:50:44 -0700
Subject: [PATCH] Use instanceof to distinguish between blocks and workspaces.

---
 core/variables.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/core/variables.js b/core/variables.js
index d9af525cb..0049ed388 100644
--- a/core/variables.js
+++ b/core/variables.js
@@ -44,7 +44,7 @@ Blockly.Variables.NAME_TYPE = 'VARIABLE';
  */
 Blockly.Variables.allUsedVariables = function(root) {
   var blocks;
-  if (root.getDescendants) {
+  if (root instanceof Blockly.Block) {
     // Root is Block.
     blocks = root.getDescendants();
   } else if (root.getAllBlocks) {
@@ -82,7 +82,7 @@ Blockly.Variables.allUsedVariables = function(root) {
  * @return {!Array.<string>} Array of variable names.
  */
 Blockly.Variables.allVariables = function(root) {
-  if (root.getDescendants) {
+  if (root instanceof Blockly.Block) {
     // Root is Block.
     console.warn('Deprecated call to Blockly.Variables.allVariables ' +
                  'with a block instead of a workspace.  You may want ' +