This test is known to fail on a debug stdlib

aschwaighofer · aschwaighofer · commit b5a8805b495e · 2016-08-03T11:10:24.000-07:00
rdar://27226313
diff --git a/test/1_stdlib/Dispatch.swift b/test/1_stdlib/Dispatch.swift
@@ -3,6 +3,9 @@
 
 // REQUIRES: objc_interop
 
+// rdar://27226313
+// REQUIRES: optimized_stdlib
+
 import Dispatch
 import Foundation
 import StdlibUnittest
