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Meson is probably the closest we'll ever get to such a thing, it's kinda declarative and has WrapDB as a dependency repository.
Tangential FYI: I'll be releasing a regex-lite crate soon, which should help binary size and compilation time for cases where you don't care too much about regex performance or Unicode support.
If we drop std Rust ceases to be economical due to the time it would take to reimplement the data structures and IO interfaces it provides, not to mention the event loop crate we use (calloop). At that point we'd be relying on so much FFI via eg. nix that the relative safety would be diminished too. After reimplementing all that it's not clear to me that we'd even save that much size, but I suppose it's possible.
Oh nice! IIRC when I checked, it was the Unicode tables that smashed the code size. I recently hit the same issue with the tracing crate, where a crate feature (for env var filtering) pulled in regex and my binary was suddenly 1MB bigger.