fix #10342: put location into warning exceptions

[RonnyPfannschmidt]

as the warning systems own warn_explicit looses the information we add them explicitly to the warning exceptions

@The-Compiler this should resolve the issue you noted

closes #10342

[nicoddemus]

I suppose this also needs a changelog, as improvement?

[RonnyPfannschmidt]

It's unreleased, so I consider it part of the initial change

[nicoddemus]

Fair enough, did not realize that. 👍

[RonnyPfannschmidt]

@The-Compiler i'd like to get your input before merging

[The-Compiler]

I wanted to try this by installing git+https://github.com/RonnyPfannschmidt/pytest.git@fix-10342-warn-explicit-add-location, but I get:

The conflict is caused by:
    The user requested pytest 5.3.1.dev3295+g14919c4b (from git+https://github.com/RonnyPfannschmidt/pytest.git@fix-10342-warn-explicit-add-location)
    pytest-bdd 6.0.1 depends on pytest>=6.2.0

Is your branch outdated or something, or is that just a setuptools-scm thing?

[RonnyPfannschmidt]

@The-Compiler i believe that i didn't push the tags to my repo, let me fix

[RonnyPfannschmidt]

@The-Compiler updated

[The-Compiler]

Great idea with only adding it if warnings are exceptions! Only a small suggestion, but looks good to go.