This bug was introduced by commit 21485e94. As a result, Blender can no longer be compiled on Windows after that commit.
When compiling in Windows (using Visual Studio 2017 or 2019), error C1061 results:
M:\BlenderSource\blender\intern\mantaflow\intern\MANTA_main.cpp(1003,11): fatal error C1061: compiler limit: blocks nested too deeply
This is due to the commit above adding more if/else clauses than 128 which exceeds the hard compiler limit for MSBuild. Also, this is a really inelegant block of string tests, and probably could use a cleanup/refactor anyway.