From add7c1a6647bcd97cf6e45f7a59b75583c4c713b Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <RyanCavanaugh@users.noreply.github.com>
Date: Tue, 13 Sep 2016 11:50:37 -0700
Subject: [PATCH] Flip check, add SEF cases

---
 src/compiler/checker.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index c06cf679f6d..6eddd2c6a20 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -13257,6 +13257,8 @@ namespace ts {
                 case SyntaxKind.Identifier:
                 case SyntaxKind.StringLiteral:
                 case SyntaxKind.RegularExpressionLiteral:
+                case SyntaxKind.TaggedTemplateExpression:
+                case SyntaxKind.TemplateExpression:
                 case SyntaxKind.NoSubstitutionTemplateLiteral:
                 case SyntaxKind.NumericLiteral:
                 case SyntaxKind.TrueKeyword:
@@ -13264,6 +13266,7 @@ namespace ts {
                 case SyntaxKind.NullKeyword:
                 case SyntaxKind.UndefinedKeyword:
                 case SyntaxKind.FunctionExpression:
+                case SyntaxKind.ClassExpression:
                 case SyntaxKind.ArrowFunction:
                 case SyntaxKind.ArrayLiteralExpression:
                 case SyntaxKind.ObjectLiteralExpression:
@@ -13465,7 +13468,7 @@ namespace ts {
                     checkAssignmentOperator(rightType);
                     return getRegularTypeOfObjectLiteral(rightType);
                 case SyntaxKind.CommaToken:
-                    if (isSideEffectFree(left) && !compilerOptions.allowUnreachableCode) {
+                    if (!compilerOptions.allowUnreachableCode && isSideEffectFree(left)) {
                         error(left, Diagnostics.Left_side_of_comma_operator_is_unused_and_has_no_side_effects);
                     }
                     return rightType;