Fix deprecation warnings

[MichaelHills]

• dyn trait
• try!
• mem::uninitialized

Not sure if I'm doing this right. macOS feedback example still runs though.

[simlay]

If I read this right, the following can kinda be summarized with:

• try is depricated at 1.39,
• dyn trait added in 1.27 with deprication with warning around 1.37?
• std::error::Error trait depricates description function in place of impl Display
• Replace std::mem::uninitialized with std::mem::MaybeUninit

[MichaelHills]

That’s correct. Hmm is there a less invasive alternative I could have done for the Error description() change to use to_string() instead of changing the implementation of Display? Is it just replacing description with to_string?

[simlay]

That’s correct. Hmm is there a less invasive alternative I could have done for the Error description() change to use to_string() instead of changing the implementation of Display? Is it just replacing description with to_string?

I think this is okay. I'm not entirely sure what the documentation means with to_string (maybe impl String::from) but this seems okay to me.

[MichaelHills]

Did further testing, forcing some errors out, seems like if main() returns Result, it'll log crashes with debug and not display. So I wrapped main to print the display string and it works for a couple of different errors I forced.

Still works on mac feedback + sine and iOS feedback.