[infamouscow]

> JS engines have had many serious vulnerabilities in their JIT optimizers, it’s not myopic at all and is a well known technique in the industry.

HotSpot and V8 are both written in C++ and get more use than any other JIT on Earth.

Can you provide a link to a CVE caused by JIT miscompilation and explain how Rust would have been able to prevent the bug in a way that C++ wouldn't?

> I agree that some folks aren’t executing untrusted ruby code so they wouldn’t have to worry about this - but how many PaaS/SaaS products out there are?

This is what Xen, KVM, and Hyper-V do.

> Or how about third party dev tools that are blindly downloaded and executed on local workstations or CI pipelines?

Are you suggesting a Ruby JIT shouldn't generate machine code that corresponds to the Ruby program, but somehow magically prevent stupid developers from doing stupid things?