From 2f22de234d4919de59bb9d5364b5eef5480d36bf Mon Sep 17 00:00:00 2001
From: Kim Topley <ktopley@apple.com>
Date: Thu, 29 Jun 2017 16:23:10 -0700
Subject: [PATCH] Fix warnings in DispatchQueue.sync() implementation when
 using a compiler with SE-0176 support.

---
 src/swift/Queue.swift | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/swift/Queue.swift b/src/swift/Queue.swift
index b946a80f4..bff1bc323 100644
--- a/src/swift/Queue.swift
+++ b/src/swift/Queue.swift
@@ -216,11 +216,13 @@ public extension DispatchQueue {
 	{
 		var result: T?
 		var error: Swift.Error?
-		fn {
-			do {
-				result = try work()
-			} catch let e {
-				error = e
+		withoutActuallyEscaping(work) { _work in
+			fn {
+				do {
+					result = try _work()
+				} catch let e {
+					error = e
+				}
 			}
 		}
 		if let e = error {