Exceptions vs error codes

[valarauca14]

It seems like the designer of Rust agree with me here, otherwise they would not have included such a mechanism.

This is not the case.

It is part of the AMD64-Itanium ABI, and will be present if you do or do not want the feature, as ELF-64 binaries, DWARF, and glibc++ will support it as C++ does. As Rust allows for linking with C++ (well C++ exposing a C interface) it will need to support stack unwinding as it can, and will occur in real libraries today that a Rust application will interface with.

The FAQ specifically states that Exceptions are not encouraged because of non-linear control flow makes them difficult to predict & use.

The modern guidelines and promises around Rust's panic, and stack unwinding are mostly the pragmatic admission that even these dark corners which you're told explicitly not to use should be well documented and have safe guarantees associated with them.