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And all the bugs just caused panics, while they could have been exploitable in C.

Of note, this report in rustc (from the list) was apparently true heap corruption due to a bug in unsafe code:

The ASN.1 one is a different kind of crash though still sounds controlled (SIGILL).

That's LLVM's abort intrinsic - no a lot of those left around, I believe OOM, panicking while panicking and stack overflow use it or used to use it.