C4702: unreachable code

[hanusek]

Hello!
I have a problem:

C:\builds\eprotect-platfrom\auth\client\include\nonstd\expected.hpp(2142) : error C2220: the following warning is treated as an error
C:\builds\eprotect-platfrom\auth\client\include\nonstd\expected.hpp(2142) : warning C4702: unreachable code

OS: Windows 2022
Visual Studio 2022 v17.5.0

https://conan.io/center/recipes/expected-lite?version=0.6.3

[subbota-a]

Me too

[szaszm]

How does that work? That line is a comment, there is no code there: https://github.com/martinmoene/expected-lite/blob/v0.6.3/include/nonstd/expected.hpp#L2142
Is it any different in your build directory?

[np-c0mp1ete]

Hello!

Repro:

#include "expected.hpp"

int main()
{
    nonstd::expected<int, int> ei = 0;
    return ei.value();
}

Compile using cl /O2 /W4 /WX main.cpp. expected-lite version is 0.6.3.

Output:

Microsoft (R) C/C++ Optimizing Compiler Version 19.39.33523 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

main.cpp
C:\test\expected.hpp(1803) : error C2220: the following warning is treated as an error
C:\test\expected.hpp(1803) : warning C4702: unreachable code