[#858] Less confusion on ambiguity
Description
Do a better job of avoiding bogus custom type errors when type families fail to reduce.
Related issue(s)
Resolves #858 (closed) by using FailWhen
or FailUnless
when possible, and custom
auxiliary type families otherwise.
✅ Checklist for your Merge Request
Related changes (conditional)
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Tests (see short guidelines)
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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 silently reappearing again.
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Documentation
Stylistic guide (mandatory)
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My commits comply with the following policy. -
My code complies with the style guide.
Edited by David Feuer