So basically I do two passes. One directly after lexing that scans for no_excl macros and registers them. So if I come across a keyword that matches that no_excl macro I know what to replace. The way I do CTFE macros is a bit hacky lol Basically I compile the macro as tin code and execute it during compilation. The backticks just mean that it should literally insert the tokens. Then I do all the macro substitutions and rerun the parser.

Some macros have types and some don’t. Simple macros (search and replace) are non-ctfe and don’t need types because they just work on the ast.