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A comment on A Guide to Undefined Behavior in C and C++ (2010). Parent comment
Rust doesn't have a formal memory model yet, but it's already known that UB in Rust is quite restricted:
https://doc.rust-lang.org/nomicon/what-unsafe-does.html
Most importantly, UB in Rust should only arise if you're writing unsafe code (barring compiler bugs). Typically, most Rust code is safe. This is a huge win.
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Rust doesn't have a formal memory model yet, but it's already known that UB in Rust is quite restricted:
https://doc.rust-lang.org/nomicon/what-unsafe-does.html
Most importantly, UB in Rust should only arise if you're writing unsafe code (barring compiler bugs). Typically, most Rust code is safe. This is a huge win.