Off the top of my head I thought C++ and Ada. However, you mention VHDL which I agree with and somebody else pointed out Javascript which is also a good point. The Javascript example (along with C++) make the point that serious computer languages are not necessarily great languages.
I would argue that Rust is not a serious language (at the moment [1]) because its still young, there is no specification and if anything happens to the one implementation it would be a disaster.
Despite C being a null pointer minefield, if someone was to sue a developer the argument could be made that it is an industry standard. In the less likely event that a Rust program hurt somebody what are you going to say?
[1] https://users.rust-lang.org/t/is-there-a-plan-to-get-a-forma...
I did a fair bit of development in C, and developed hard real time systems in VHDL that did involve life & death, but, wouldn't call any language used in the industry generating value as a non serious language...