A New Way to Think About Borrow Checking (In Reverse)
Summary
This article presents Valen's backward borrow checker, which walks through code in reverse to verify memory safety. It explains the four main phases (parsing, static typing, static grouping, and safety checking) and emphasizes why reversing the safety check can be advantageous, including handling loops and performance considerations. It also discusses future improvements and how this approach compares to Rust's borrow checking.