In ghc-8.6.3 your code can produce redundant constraint warning
if you derive Container for newtype, but in ghc-9.0.2 and newer
no warnings would be produced.
Solution
Added test, that should be compiled with ghc-9.0.2 and newer
without warnings.
Related issues(s)
Resolves #208
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Related changes (conditional)
Tests
[ ] If I added new functionality, I added tests covering it.
[ ] If I fixed a bug, I added a regression test to prevent the bug from
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Documentation
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[ ] provided a migration guide for breaking changes if possible
Stylistic guide (mandatory)
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Description
Problem
In
ghc-8.6.3your code can produceredundant constraintwarning if you deriveContainerfor newtype, but inghc-9.0.2and newer no warnings would be produced.Solution
Added test, that should be compiled with
ghc-9.0.2and newer without warnings.Related issues(s)
✓ Checklist for your Pull Request
Ideally a PR has all of the checkmarks set.
If something in this list is irrelevant to your PR, you should still set this checkmark indicating that you are sure it is dealt with (be that by irrelevance).
Related changes (conditional)
Tests
Documentation
I checked whether I should update the docs and did so if necessary:
Record your changes
Stylistic guide (mandatory)
[x] My commit history is clean (only contains changes relating to my issue/pull request and no reverted-my-earlier-commit changes) and commit messages start with identifiers of related issues in square brackets.
Example:
[#42] Short commit descriptionIf necessary both of these can be achieved even after the commits have been made/pushed using rebase and squash.