Actually, this test only fails on Darwin platforms...

slavapestov · slavapestov · commit 55f0791a1064 · 2016-05-21T13:11:30.000-07:00
https://bugs.swift.org/browse/SR-1584
diff --git a/validation-test/compiler_crashers_fixed/00429-vtable.swift b/validation-test/compiler_crashers_fixed/00429-vtable.swift
@@ -9,7 +9,7 @@
 
 // REQUIRES: asserts
 // SR-1584
-// XFAIL: *
+// XFAIL: objc_interop
 
 }
 struct S {
