Cannot build with msvc and C++20

[asmei1]

Description

I'm trying to build GTSAM library using conan 1.62.0 using C++20. Compilation fails on gtsam/base/chartTesting.h file.
There is a function testDefaultChart used in CHECK_CHART_CONCEPT macro.

To be more specific, compilation fails on gtsam::DefaultChart<T>. But what is weird for me that none of above types (function, macro, gtsam::DefaultChart<T> type) is not used anywhere. The error was exactly the same as in this comment.

When I remove this file, everything compiles. I think that this file is leftover after some cleaning and it should be removed in future

Steps to reproduce

1. Build GTSAM with msvc, with C++20, build tools v143.

Expected behavior

Successful build

Environment

Gtsam (I tried 4.0.2, 4.0.3, 4.2)
Windows
MSVC; v143
C++20
conan 1.62.0
cmake 3.27.1

Additional information

[adam-brz]

I've also stumbled upon this issue. It would be nice to further investigate this.