There's a DeprecationWarning from the test_combo_field tests on Python 3.8.

test_combo_field_icon_formatter (pyface.fields.tests.test_combo_field.TestComboField) ... /Users/mdickinson/.venvs/traits/lib/python3.8/site-packages/pkg_resources/__init__.py:1156: DeprecationWarning: Use of .. or absolute path in a resource path is not allowed and will raise exceptions in a future release.
 

Hi Taine,

In one of your example, you have

@trait Addable{L, R} begin
    (+) :: [L, R] => Any
    (+) = Base.:+
end

I'd like to do something like this, but avoid the Any. I was thinking something like

@trait Addable{L, R, X} where {X = inferAddable(L,R)} begin
    (+) :: [L, R] => X
    (+) = Base.:+
end

But then I'm having trouble getting the `@i