Okay, I found my issue, mostly. It seems that Clojure 1.9 and 1.10 both now have a clojure.core.specs.alpha.clj file.
This file seems to be the only file that is not AOT compiled by the maven compile script for Clojure. Thus the Jar for Clojure only has it as source, and is missing the .classes for it. We have custom Ant tasks to compile Clojure, where we call compile-ns ourselves on our source namespaces. I was using Clojure 1.9 in our Ant tasks, which meant that as part of running compile-ns on our namespace, because they depend on Clojure core as well, clojure.core.specs.alpha.clj from the Clojure 1.9 jar was also being compiled. Thus, our project jar now contained the 1.9 classes for core specs. Now, we would use Clojure 1.10 to run our project, but the Clojure 1.9 core specs fail to validate amp-impl of Clojure 1.10. I'm guessing it was changed along with its spec inside core specs. So we were getting a weird syntax error at runtime for every namespace that depend on clojure.core. I have a few questions based on this: 1) Why is clojure.core.specs.alpha.clj the only thing not AOT compiled in the Clojure jar? 2) I realized that I probably shouldn't compile Clojure 1.10 code with Clojure 1.9, and I bumbed our Ant code to use Clojure 1.10, and that fixed it. So what are the compiler compatibility? Can newer Clojure versions compile older Clojure code? Is it only two version back? Is this tested? Or should I always use equal versions to compile? Is forward compatibility a thing? Etc. 3) Is compile-ns transitive? I was surprised to see that it also compiles clojure.core.specs.alpha. 4) Isn't it a bit strange that if I AOT compile my code, my Jar gets .class files from Clojure core as well? Even though I don't get the error anymore, I still have clojure.core.specs.alpha classes from my jar on the classpath, and the source from Clojure on it as well. Thanks -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
