A function to just raise an exception.

[uriva]

This is because you can't easily use a lambda to raise an exception, and sometimes the need arises to translate an exception X into exception Y when using toolz.excepts.

[mentalisttraceur]

If this doesn't get merged and you want something like this:

1. funcy has a raiser function which does the same thing as your just_raise in this PR, and can also pass arguments if constructing a new exception instance.

2. My raise provides a minimal implementation of raise as a function. I regularly do lambda ...: raise_(...), and you can make your just_raise from it: just_raise = partial(partial, raise_).

[uriva]

this is quite old, i've implemented this already in https://github.com/hyroai/gamla

[mentalisttraceur]

Oh haha I recognize that library name. We had a similar talk in #472 .