From 6aecd43d9a7edca358df3e0ef629e0b2d994c6d0 Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <nathansa@microsoft.com>
Date: Fri, 30 Oct 2015 15:03:44 -0700
Subject: [PATCH] Fix `isConstructorParameter`

---
 src/compiler/checker.ts | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index a1207d023c7..6ea8d896326 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -4427,10 +4427,17 @@ namespace ts {
             error(node, Diagnostics.A_this_type_is_available_only_in_a_non_static_member_of_a_class_or_interface);
             return unknownType;
 
-            function isConstructorParameter(node: TypeNode, container: Node) {
+            function isConstructorParameter(node: Node, container: Node) {
                 if (container.kind === SyntaxKind.Constructor) {
                     let ctor = (<ConstructorDeclaration>container);
-                    return !ctor.body.statements.some(st => st === node.parent);
+                    while (node && node !== ctor) {
+                        if (node === ctor.body) {
+                            return false;
+                        }
+                        node = node.parent;
+                    }
+
+                    return true;
                 }
             }
         }