"Note that M4 doesn’t support non-ASCII characters in definitions so my ideal macros had to lose their $ prefixes." $ is ASCII character 36. I believe the inte

"Note that M4 doesn’t support non-ASCII characters in definitions so my ideal macros had to lose their $ prefixes." $ is ASCII character 36. I believe the intended restriction is that M4 restricts macro names to be made up of letters, digits, and the '_' character (and cannot start with a digit), which means you can't have a $ in the macro name.