Fix for issue regarding numba.

[Torxed]

Converts <class 'OSError'> into str(err) when calling warnings.warn(err).

Relevant gist: https://gist.github.com/Torxed/10f3bd35ddbd8ceabda8f7a002fdff6c

Code to reproduce:

import pyglet
import numba

game_window = pyglet.window.Window(600, 400)
icon = pyglet.image.load("test.png")
game_window.set_icon(icon)
pyglet.app.run()

Original report: https://stackoverflow.com/questions/62383035/error-while-import-numba-module-in-pyglet-projects

[benmoran56]

Thanks, looks good!

[caffeinepills]

This is bizarre as warnings.warn seems to take exceptions:

>>> import warnings
>>> test = OSError("Failed")
>>> warnings.warn(test)

Warning (from warnings module):
  File "__main__", line 1
UserWarning: Failed
>>> 

[benmoran56]

The best we can figure is that Numba is mutating things somehow during the JIT process. The traceback indicated that warn would only accept string/bytes, but that certainly doesn't seem to be the case in my Python interpreter either.

In any case, this seems like an easy enough fix for whatever is causing it.

[Torxed]

I was having issues using the -m trace --trace module to diagnose the issue. Not sure the JIT optimization liked what I was doing.