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With clojure 1.9 clojure.spec will be available and core libraries should be updated. This should make error messages much better.

This library however could be a useful edition when you encounter the lower level errors.

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Is there any date on when 1.9 will be released? I searched a little bit for the date but couldn't find anything concrete (I know I can access lambdas and that there is a spec "antishim"[1] for 1.8 - I'm just curious).

[1] https://github.com/tonsky/clojure-future-spec

There is no release date as of yet [1]. But in that thread Sean Cornfield:

> Obligatory: “we’ve been running the 1.9 Alphas in production for months so that we can leverage clojure.spec” – no problems so far.

[1]: https://groups.google.com/forum/#!topic/clojure/i7ipoze2jos

My company's also been using 1.9 alphas for months, have maybe encountered a minor bug or two, but very few & nothing major.

right b/c you can't clojure.spec everything.

Because some of Clojure Core is written in Java or is there another reason that I'm missing?

Some things in Clojure are so dynamic, that it's still an open research problem as to how you can properly assign types to them.

because clojure.spec, in practice, only governs interaces. It's not going to help you with bugs that are as a result of data structures generated and manipulated inside of a function.

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