From 9a6d308203f7bc8cc73f6ecb00ae1dbd5fc14267 Mon Sep 17 00:00:00 2001
From: Ron Buckton <rbuckton@microsoft.com>
Date: Wed, 13 May 2015 11:15:51 -0700
Subject: [PATCH] Simplified parenthesis check for await as yield.

---
 src/compiler/emitter.ts | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
index e31989e6726..ba4b1010dba 100644
--- a/src/compiler/emitter.ts
+++ b/src/compiler/emitter.ts
@@ -1381,14 +1381,13 @@ var __awaiter = (this && this.__awaiter) || function (generator, ctor) {
             }
 
             function needsParenthesisForAwaitExpressionAsYield(node: AwaitExpression) {
-                for (let current: Node = node; isExpression(current.parent); current = current.parent) {
-                    if (current.parent.kind === SyntaxKind.BinaryExpression) {
-                        if ((<BinaryExpression>current.parent).left === current) {
-                            return true;
-                        }
-                    }
+                if (node.parent.kind === SyntaxKind.BinaryExpression && !isAssignmentOperator((<BinaryExpression>node.parent).operatorToken.kind)) {
+                    return true;
                 }
-                
+                else if (node.parent.kind === SyntaxKind.ConditionalExpression && (<ConditionalExpression>node.parent).condition === node) {
+                    return true;
+                }
+
                 return false;
             }