Walter has recently been working on improving the C++ mangling, so be sure to test the latest dmd nightly build and if that doesn't work be sure to file bug report(s).https://github.com/dlang/dmd/pull/7250 https://github.com/dlang/dmd/pull/7259 https://github.com/dlang/dmd/pull/7272
Done: https://issues.dlang.org/show_bug.cgi?id=17975
