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What is the most ergonomic library to diff data structures in a test suite these days?

Haskell Community [Unofficial] April 28, 2026
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ozkutuk:

For my use case, one shortcoming of the library that ultimately didn’t allow me to fully substitute it with our in-house solution is that in the case where two values are structurally the same but have different values (e.g. just two Ints with different values) the diff output just reports them as “not equal”, and does not display the actual values.

Amazingly enough, @fpringle has already created a PR addressing this since I have posted this comment, so hopefully I can fully vouch for using this library pretty soon. Thanks for tackling this, and also being extremely fast at that!

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