Lisp and Scheme macros are just code that happens to execute at runtime, too. They don't necessarily need to transform the AST, though that's what they're often

Lisp and Scheme macros are just code that happens to execute at runtime, too. They don't necessarily need to transform the AST, though that's what they're often used for. Like with Zig, you are limited mostly by what is available in the environment at macro expansion time; unlike Zig, you can do things that generate allocations.