A big change like this makes me hopeful Zig may revisit and improve other design choices in the future.
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I think this should be a warning on debug builds and an error on release builds, but it's a relatively minor thing and not a deal breaker by any means.
If this is the worst thing that people would like to see revisited, Zig must be doing amazingly well.
It totally breaks my normal workflow. I don’t use zig at all because of this misfeature. Warn in debug and error on release builds would be strange but fine.