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Cyclone is another interesting project that adds regions to C (and much much more )

unfortunately it doesn't look maintained anymore ,which is a pity because the language looks fantastic. Just learned about it this year...

AFAIK Cyclone was a major inspiration for Rust, so you could say its legacy lives on.

The user manual is from 2001, interesting idea nevertheless.

Timestamp in files is June 29, 2001.

C is probably older.