From fae03d8add5d92e21affd8abc455bcd4df3389f8 Mon Sep 17 00:00:00 2001
From: "Duncan P. N. Exon Smith" <dexonsmith@apple.com>
Date: Sun, 3 Mar 2019 20:17:53 +0000
Subject: [PATCH] Modules: Document that ReadASTCore exits its final loop via
 `return`, NFC

The final loop never breaks.  Document that by following it with
llvm_unreachable.

llvm-svn: 355294
---
 clang/lib/Serialization/ASTReader.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index 9626418f6862..5ad21604f4e7 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -4257,7 +4257,7 @@ ASTReader::ReadASTCore(StringRef FileName,
     }
   }
 
-  return Success;
+  llvm_unreachable("unexpected break; expected return");
 }
 
 ASTReader::ASTReadResult