From 16103a9ca2ba1d23e6e781fb16da83950eb073b8 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Mon, 30 Jan 2017 15:40:31 -0800
Subject: [PATCH] Fix isSymbolInScopeOfMappedTypeParameter to include mapped
 types

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

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index c2e0c66ce3f..780bda03b0a 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -6864,6 +6864,11 @@ namespace ts {
                             }
                         }
                         break;
+                    case SyntaxKind.MappedType:
+                        if (contains(mappedTypes, getDeclaredTypeOfTypeParameter(getSymbolOfNode((<MappedTypeNode>node).typeParameter)))) {
+                            return true;
+                        }
+                        break;
                     case SyntaxKind.JSDocFunctionType:
                         const func = node as JSDocFunctionType;
                         for (const p of func.parameters) {