disable mainactor test

kavon · web-flow · commit adf223a0520f · 2021-01-15T14:17:01.000-08:00
there's an unseen failure in CI
diff --git a/test/Concurrency/Runtime/mainactor.swift b/test/Concurrency/Runtime/mainactor.swift
@@ -2,6 +2,7 @@
 
 // REQUIRES: executable_test
 // REQUIRES: concurrency
+// REQUIRES: rdar73262638
 
 // REQUIRES: OS=macosx || OS=ios
 // FIXME: should not require Darwin to run this test once we have async main!
