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You can replace C for new code (arguably) but how the hell does one replace legacy C? Can Unix realistically be rewritten in something else? Or Postgres?

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Or SQLite - https://www.sqlite.org/whyc.html

The list is very long. And also I'm not sure for all use cases Rust is a better C.

Postgres certainly can. It's less than two million lines of code. Just Firefox has more Rust code than entire Postgres.

It's possible, just doesn't make much financial sense so I'm not expecting it to happen.

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