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This is a very good point and is the fatal flaw of most metaprogramming. It does seem easy to generate quite confusing error messages by making minor typos. Clang does a much better job with macro expansion errors than gcc, but it's still not great. As for actually using debuggers, it looks like you're on your own to understand the implementation enough to be useful. I don't know if it would be feasible to write a gdb plugin to improve the experience.

OTOH, Cos offers more compile-time type safety than GLib, so you might hope that you'd need to spend less time in the debugger.




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