Fix RowValue which can reference an invalid Ok that defined outside

[kubo]

Thanks!

Could you change tests/procmacro.rs as follows?

1. Rename fn test_procmacro_ok_shadow() to fn procmacro_ok_shadow()
2. Add #[allow(dead_code)] to fn procmacro_ok_shadow() to suppress warning: function is never used
3. Add #[allow(unused_imports)] to use AnotherResult::Ok; to suppress warning: unused import
4. Run cargo fmt

[kubo]

@importcjj After you removes the empty line between #[allow(dead_code)] and enum AnotherResult<T, E>, could you merge your commits into one by git rebase -i (see here) and git push -f in order to simplify revision history?

This is optional. If you don't, I'll use "squash and merge" instead of "merge commit" (default option). (see here)

[importcjj]

I removed the empty line， actual it doesn't take any effect.

[kubo]

Thanks for contribution.

I'll release 0.5.6 this weekend or the next weekend.