Playground - Exn

Context aware errors.

https://github.com/fast/exn

https://fast.github.io/blog/stop-forwarding-errors-start-designing-them/

example output:

the program died, at src/main.rs:35:34
|
|-> failed to create file: res/foo.txt, at src/main.rs:79:43
|
|-> Permission denied (os error 13), at src/main.rs:79:43