Logger

[makingthematrix]

Look for a logger with logging:

• to stdout
• to file
• with at least debug/warning/error levels
• visible in results of unit tests (strangely, it's not always obvious)
• with the ability to be optimized out in the production code (but eg. errors should stay)

[makingthematrix]

That wasn't hard.
The standard way to log is to use the log trait: https://docs.rs/log/0.4.1/log/
It's just an abstraction, which is super nice, because this way I can easily choose my own implementation, but keep it outside the library, so the user of the library can use another implementation if needed. I'm really glad someone thought about it.

My chosen implementation is flexi_logger: https://docs.rs/flexi_logger/0.6.13/flexi_logger/
I chose it mainly because the author made effort to explain in the docs how to connect it to log.
Merci bp!