Given 


    struct MyBool
    {
        MyBool(bool b = false) {}
        operator bool() const { return false; }
    };

    int main()
    {
        MyBool mb;
        bool result = true ? false : mb;
        return 0;
    }


C:\dev\tmp>cl /c main.cpp
Microsoft (R) C/C++ Optimizing Compiler Version 19.00.24325.6 for x86
Copyright (C) Microsoft Corporation.  All rights reserved.

main.cpp

C:\dev\tmp>"c:\dev\src\llvm\build\Release\msbuild-bin\cl.exe" /c main.cpp
main.cpp(11,21):  error: conditional expression is ambiguous; 'bool' can be converted to 'MyBool' and vice versa
        bool result = true ? false : mb;
                           ^ ~~~~~   ~~
1 error generated.


It could be considered to match the behavior of cl.exe