From 72a1e85cd7f1b189b509a723ed8473ae265573ca Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <nathansa@microsoft.com>
Date: Tue, 6 Dec 2016 13:04:45 -0800
Subject: [PATCH] Check binding initialisers in parameters as well

---
 src/compiler/checker.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 7ea84d093ec..61ccbff9bb0 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -17041,7 +17041,8 @@ namespace ts {
                     // so we need to do a bit of extra work to check if reference is legal
                     const enclosingContainer = getEnclosingBlockScopeContainer(symbol.valueDeclaration);
                     if (enclosingContainer === func) {
-                        if (symbol.valueDeclaration.kind === SyntaxKind.Parameter) {
+                        if (symbol.valueDeclaration.kind === SyntaxKind.Parameter ||
+                           symbol.valueDeclaration.kind === SyntaxKind.BindingElement) {
                             // it is ok to reference parameter in initializer if either
                             // - parameter is located strictly on the left of current parameter declaration
                             if (symbol.valueDeclaration.pos < node.pos) {