pub unsafe fn unreachable() -> !
Tells LLVM that this point in the code is not reachable, enabling further optimizations.
NB: This is very different from the unreachable!() macro: Unlike the macro, which panics when it is executed, it is undefined behavior to reach code marked with this function.
© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/mem/fn.unreachable.html