In his talk he demos mixing syntax 1 and 2 (his terms) in the same file. Preprocessor macros work fine unless you enable "pure" mode. He also demos error messa

In his talk he demos mixing syntax 1 and 2 (his terms) in the same file. Preprocessor macros work fine unless you enable "pure" mode. He also demos error messages, and was able to get errors from a cpp compiler (msvc) that point to his cpp2 file with a line number and readable error.