Exceptions, and stack unwinding in general, are not acceptable in many
systems projects. Many, perhaps most, C++ projects turn off exceptions.
This is true of all browser engines I know of, as well as games and OS
kernels--essentially the niches where C++ is the strongest. The primary
reason is that the unwind tables are large, and unwinding can inhibit
optimizations.
If we made the standard library require exceptions, then it would be
harder to use Rust in those niches, and it would compromise the goals of
Rust as a systems language. Therefore, we have to design our APIs to not
require exceptions.
Patrick
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