================
@@ -0,0 +1,24 @@
+// RUN: %clang -fsyntax-only -Xclang -analyze -Xclang 
-analyzer-checker=cplusplus.PlacementNew -Xclang -verify -std=c++17 %s
+
+#include <new>
----------------
NagyDonat wrote:

These tests do not include real system headers (if I understand correctly, this 
is because the exact content of the system header could vary between different 
environments). Tests that validate the analysis of language/library features 
that are declared in system headers usually include "system header simulator" 
header files that are known to be consistent between environments and declare 
the relevant parts of the STL.

For example `placement-new.cpp` (the other test file that you edit) uses 
`"Inputs/system-header-simulator-cxx.h"`, I'd guess that it would be the good 
choice for this file as well.

https://github.com/llvm/llvm-project/pull/150161
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