From 6f766c2872c1c43e96b2692ac3bf07a38b32e877 Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <nathansa@microsoft.com>
Date: Fri, 8 Apr 2016 12:50:07 -0700
Subject: [PATCH 1/2] Correct destructuring assignment to empty object

Previously, chained destructuring object assignments would fail when the leftmost target was empty because the shortcut code would forget to check whether the right-hand side was also a destructuring assignment.
---
 src/compiler/transformers/destructuring.ts | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/compiler/transformers/destructuring.ts b/src/compiler/transformers/destructuring.ts
index 7cd37bade6c..06e8a354d85 100644
--- a/src/compiler/transformers/destructuring.ts
+++ b/src/compiler/transformers/destructuring.ts
@@ -17,10 +17,16 @@ namespace ts {
         node: BinaryExpression,
         needsValue: boolean,
         recordTempVariable: (node: Identifier) => void,
-        visitor?: (node: Node) => VisitResult<Node>) {
+        visitor?: (node: Node) => VisitResult<Node>): Expression {
 
         if (isEmptyObjectLiteralOrArrayLiteral(node.left)) {
-            return node.right;
+            const right = node.right;
+            if (isDestructuringAssignment(right)) {
+                return flattenDestructuringAssignment(context, right, needsValue, recordTempVariable, visitor);
+            }
+            else {
+                return node.right;
+            }
         }
 
         let location: TextRange = node;
@@ -401,4 +407,4 @@ namespace ts {
             return emitTempVariableAssignment(value, location);
         }
     }
-}
\ No newline at end of file
+}

From e6670811b0b762b953ea3f7fe3bd53b00aa688ad Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <nathansa@microsoft.com>
Date: Tue, 12 Apr 2016 10:46:27 -0700
Subject: [PATCH 2/2] Remove parentheses and accept baselines

---
 tests/baselines/reference/emptyAssignmentPatterns02_ES5.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/baselines/reference/emptyAssignmentPatterns02_ES5.js b/tests/baselines/reference/emptyAssignmentPatterns02_ES5.js
index 27a0b5f9b61..370e019104f 100644
--- a/tests/baselines/reference/emptyAssignmentPatterns02_ES5.js
+++ b/tests/baselines/reference/emptyAssignmentPatterns02_ES5.js
@@ -9,8 +9,8 @@ let x, y, z, a1, a2, a3;
 //// [emptyAssignmentPatterns02_ES5.js]
 var a;
 var x, y, z, a1, a2, a3;
-((x = a.x, y = a.y, z = a.z, a));
-((a1 = a[0], a2 = a[1], a3 = a[2], a));
+(x = a.x, y = a.y, z = a.z, a);
+(a1 = a[0], a2 = a[1], a3 = a[2], a);
 
 
 //// [emptyAssignmentPatterns02_ES5.d.ts]