Normal rust without warnings to me is much safer than most Misra C compliant code. Misra C is an attempt to avoid 80% of C's undefined behavior and other pitfalls, but those 20% that are left are still worse than most of what can go wrong in rust.

The tooling that is needed is mostly productivity tooling, like better code completion (rust analyzer is now pretty promising after RLS kind of stagnated). And maybe better ways to show code coverage.

The problem for usage in safety critical areas is mostly certification and having a stable spec for the language.