Build failure on clean checkout

[kant2002]

I have VS2022 installed and only PlatformToolset=v143 only installed. Running build.cmd x64 Debug produce following error

ClCompile:
  All outputs are up-to-date.
  C:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Tools\MSVC\14.33.31517\bin\HostX64\x64\CL.exe /c /IC:\d\github\CsWinRT\src\packages\Microsoft.Windows.WinMD.1.0.191022.1\build\native\..\..\ /IC:\d\g
  ithub\CsWinRT\src\_build\x64\Debug\cswinrt\obj\ /ZI /JMC /nologo /W4 /WX /diagnostics:column /sdl /MP /Od /D _UNICODE /D UNICODE /D _DEBUG /D "VERSION_NUMBER=\"0.0.0.0\"" /D "VERSION_STRING=\"0.0.0-private.
  0\"" /D NOMINMAX /Gm- /EHsc /RTC1 /MDd /GS /fp:precise /Zc:wchar_t /Zc:forScope /Zc:inline /std:c++17 /permissive- /Yu"pch.h" /Fp"C:\d\github\CsWinRT\src\_build\x64\Debug\cswinrt\obj\cswinrt.pch" /Fo"C:\d\g
  ithub\CsWinRT\src\_build\x64\Debug\cswinrt\obj\\" /Fd"C:\d\github\CsWinRT\src\_build\x64\Debug\cswinrt\obj\vc143.pdb" /external:W4 /Gd /TP /FC /errorReport:queue  /bigobj main.cpp
  main.cpp
C:\d\github\CsWinRT\src\cswinrt\code_writers.h(208): error C2220: the following warning is treated as an error [C:\d\github\CsWinRT\src\cswinrt\cswinrt.vcxproj]
C:\d\github\CsWinRT\src\cswinrt\code_writers.h(208): error C2220: the following warning is treated as an error [C:\d\github\CsWinRT\src\cswinrt\cswinrt.vcxproj]
C:\d\github\CsWinRT\src\cswinrt\code_writers.h(208): error C2220: the following warning is treated as an error [C:\d\github\CsWinRT\src\cswinrt\cswinrt.vcxproj]
C:\d\github\CsWinRT\src\cswinrt\code_writers.h(208): error C2220: the following warning is treated as an error [C:\d\github\CsWinRT\src\cswinrt\cswinrt.vcxproj]
C:\d\github\CsWinRT\src\cswinrt\code_writers.h(208): warning C4702: unreachable code [C:\d\github\CsWinRT\src\cswinrt\cswinrt.vcxproj]
C:\d\github\CsWinRT\src\cswinrt\code_writers.h(208): warning C4702: unreachable code [C:\d\github\CsWinRT\src\cswinrt\cswinrt.vcxproj]
C:\d\github\CsWinRT\src\cswinrt\code_writers.h(208): warning C4702: unreachable code [C:\d\github\CsWinRT\src\cswinrt\cswinrt.vcxproj]
C:\d\github\CsWinRT\src\cswinrt\code_writers.h(208): warning C4702: unreachable code [C:\d\github\CsWinRT\src\cswinrt\cswinrt.vcxproj]
C:\d\github\CsWinRT\src\cswinrt\code_writers.h(208): warning C4702: unreachable code [C:\d\github\CsWinRT\src\cswinrt\cswinrt.vcxproj]

What is puzzling me, is that I clearly see that 4702 warning is disabled here.

CsWinRT/src/cswinrt/code_writers.h

Lines 206 to 208 in 28be51f

	throw_invalid("type definition expected");
	#pragma warning(disable:4702)
	return TResult();

Actually I'm not on main, but on this branch this #1219 but that's not really matter because that's how I force cswinrt.vcprojx use v143.

[manodasanW]

This looks like it is related to the below from https://docs.microsoft.com/en-us/cpp/preprocessor/warning?view=msvc-170

Use of the warning pragma in the function to change the state of a warning number larger than 4699 only takes effect after the end of the function.

I have a branch that addresses this, brings in your change in PR and your testwinrt change, and addresses a couple other issues. Will have a PR out for it tomorrow. Thanks for bringing this up.