From ff47fa124ae08278ce9e5a5997e373dfa22b1e80 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Thu, 27 Aug 2015 12:52:34 -0700
Subject: [PATCH] Property check expressions in class extends clause

---
 src/compiler/checker.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 73fa64ed499..5d0c0cd7ffc 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -12613,6 +12613,7 @@ namespace ts {
                 if (baseTypes.length && produceDiagnostics) {
                     let baseType = baseTypes[0];
                     let staticBaseType = getBaseConstructorTypeOfClass(type);
+                    checkSourceElement(baseTypeNode.expression);
                     if (baseTypeNode.typeArguments) {
                         forEach(baseTypeNode.typeArguments, checkSourceElement);
                         for (let constructor of getConstructorsForTypeArguments(staticBaseType, baseTypeNode.typeArguments)) {
@@ -13682,6 +13683,8 @@ namespace ts {
                 case SyntaxKind.VariableDeclaration:
                 case SyntaxKind.VariableDeclarationList:
                 case SyntaxKind.ClassDeclaration:
+                case SyntaxKind.HeritageClause:
+                case SyntaxKind.ExpressionWithTypeArguments:
                 case SyntaxKind.EnumDeclaration:
                 case SyntaxKind.EnumMember:
                 case SyntaxKind.ExportAssignment: