[WIP] Improve typed dict KeyError traceback

[Arenhart]

While coding a parallel implementation with Numba that used typed dict, I had a lot of trouble debugging because the KeyError exception did not return any information. I made a small change in the dictobject.py to return the key value and type on the traceback, and it helped a lot. This commit includes this modification.
However, it would have been better if the traceback pointed to the actual python line where the KeyError occurred, though I don't know if this is possible, or how to do it. I'm creating this PR as WIP in hope I can get some insight on this viability.

[esc]

@Arenhart this modification looks good. While I don't know if the source line could be printed alongside the error, I would recommend trying to get this change merged. To do so, it would need some tests however to make sure that the error message does match what is intended.

[Arenhart]

I'm having a lot trouble trying to implement the tests. When I try to run the Numba tests, a get a llvmlite version error

ImportError: Numba requires at least version 0.43.0 of llvmlite.
Installed version is 0.42.0.

I did not find version 0.43 in conda, and when I tried to compile llvmlite 0.43, I failed because the windows distribution of LLVM doesn't have the llvm-config file.

Is there some solution besides compiling LLVM? Otherwise I think I'll wait until llvmlite 0.43 gets uploaded to conda.

[esc]

I'm having a lot trouble trying to implement the tests. When I try to run the Numba tests, a get a llvmlite version error

ImportError: Numba requires at least version 0.43.0 of llvmlite. Installed version is 0.42.0.

I did not find version 0.43 in conda, and when I tried to compile llvmlite 0.43, I failed because the windows distribution of LLVM doesn't have the llvm-config file.

Is there some solution besides compiling LLVM? Otherwise I think I'll wait until llvmlite 0.43 gets uploaded to conda.

During development, you can fetch the dev package for llvmlite using:

$ conda install -c numba/label/dev llvmlite

it should always get you an llvmlite that will allow the Numba checkout of main to compile. I also maintain a repo with some personal tooling for Numba including a makefile, if you need to look at the commands used to build and run tests and so on:

https://github.com/esc/numba-dev-files/blob/master/Makefile