I haven't looked at Zig too closely yet (only started just a few minutes ago), but it immediately appears to me that this violates one of the requirements I suggested, as demonstrated by this use-case wish from my previous comment:

> > using the new language's compiler as the project compiler front end's drop-in replacement (without having to make any changes to the code at all for this first step)

I'll look into Zig more, though. Maybe I'll like it.

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I stand corrected, given my phrasing. I should have specified that it needs to also support incrementally adding the new language's features while most of the code is still unaltered C, rather than (for instance) having to suddenly replace all the includes and function prototypes just because you want to add (in the case of Zig) an error "catch" clause.