MSVC compiler error with boost ver 1.71

From: John Emmas (john_at_[hidden])
Date: 2021-06-23 14:07:30

Hi there - I'm using boost ver 1.71 and I'm seeing a strange problem 
with VS2019. Simply #including this line at the top of a source file 
will generate a compiler error if I try to build in Debug mode (Release 
builds are okay...)

       #include <boost/property_tree/json_parser.hpp>

When I say a "compiler error" I'm not referring to one of the usual 
CXXXX messages - what happens is this:-

 >INTERNAL COMPILER ERROR in 'C:\Program Files (x86)\Microsoft Visual 
Studio\2019\Community\VC\Tools\MSVC\14.29.30037\bin\HostX86\x64\CL.exe'
 >    Please choose the Technical Support command on the Visual C++
 >    Help menu, or open the Technical Support help file for more 
information
 >Done building project "ardour.vcxproj" -- FAILED.
 >========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped 
==========

Just wondering if anyone else has encountered this..?

Thanks, John