================
@@ -0,0 +1,116 @@
+//===- Caching.cpp 
--------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/Caching.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Testing/Support/Error.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+
+#define ASSERT_NO_ERROR(x)                                                     
\
+  if (std::error_code ASSERT_NO_ERROR_ec = x) {                                
\
+    SmallString<128> MessageStorage;                                           
\
+    raw_svector_ostream Message(MessageStorage);                               
\
+    Message << #x ": did not return errc::success.\n"                          
\
+            << "error number: " << ASSERT_NO_ERROR_ec.value() << "\n"          
\
+            << "error message: " << ASSERT_NO_ERROR_ec.message() << "\n";      
\
+    GTEST_FATAL_FAILURE_(MessageStorage.c_str());                              
\
+  } else {                                                                     
\
+  }
----------------
anjenner wrote:

This is a standard defensive programming technique with multiline macros to 
cause a compile error when someone writes "ASSERT_NO_ERROR(...) else { ... }" 
by mistake.

https://github.com/llvm/llvm-project/pull/115331
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