New fatal macro

[dekellum]

Easy to implement. Somewhat harder to test. The idea for this came in rust-lang/log#317, when observing the use pattern of a error! followed by panic! with the same or similar message.

Consider that: https://github.com/sfackler/rust-log-panics could be a better general solution to avoiding the perceived redundancy, at the expense of per thread init which might not always be easy to arrange?

[dekellum]

Regarding log_panics, I'm surprised to learn that std::panic::set_hook is a global resource, not a per-thread. That seems like something that will be viewed as a limiting for rust in the future, but I also don't find any set_hook calls in crates I am thus far concerned with: tokio, crossbeam, parking_lot, hyper.

[dekellum]

See also: https://internals.rust-lang.org/t/pre-rfc-should-std-set-hook-have-a-per-thread-version/9518/2?u=dekellum