diff --git a/clang/lib/Sema/AnalysisBasedWarnings.cpp b/clang/lib/Sema/AnalysisBasedWarnings.cpp
--- a/clang/lib/Sema/AnalysisBasedWarnings.cpp
+++ b/clang/lib/Sema/AnalysisBasedWarnings.cpp
@@ -574,6 +574,7 @@
     D.diag_AlwaysFallThrough_HasNoReturn = 0;
     D.diag_AlwaysFallThrough_ReturnsNonVoid =
         diag::warn_falloff_nonvoid_coroutine;
+    D.diag_NeverFallThroughOrReturn = 0;
     D.funMode = Coroutine;
     return D;
   }