Yes, there are multiple libraries, for example:

https://github.com/clojureman/special

Thank you! I will include this in the book. How should I credit you?

I am Divyansh Prakash - github.com/divs1210

The credit goes to the author of that library, though. :)

All the best for your book!

Thanks. It was you who directed me towards this implementation and made it possible for me to mention it in the book, though, so I only consider it fair if I also add you to the book's Hall of Fame.

for conditions in Clojure also check this: https://gist.github.com/msgodf/6f4e43c112b8e89eee3d

Thank you for the link. How should I credit you?

I haven't explored Clojure. If it allows one to customize the means in which errors are signaled (read: force the language to not immediately throw a Java exception on an error, and instead execute some code), then one should be able to implement both signaling and a debugger.

It might not be easy to tell Clojure or the JVM to not be trigger happy with throwing exceptions and therefore destroying the stack. Perhaps one will find a way through!