unify.clj issues

[asuresh-quinnox]

D:\examples\acme-buddy-master\acme-auth>lein -version
Leiningen 2.9.3 on Java 11.0.6 OpenJDK 64-Bit Server VM

D:\examples\acme-buddy-master\acme-auth>java -version
openjdk version "11.0.6" 2020-01-14 LTS
OpenJDK Runtime Environment 18.9 (build 11.0.6+10-LTS)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.6+10-LTS, mixed mode)

Unable to run the codebase with above version, Will try to upgrade some of the dependencies.

D:\examples\acme-buddy-master\acme-auth>lein ring server-headless
clojure.lang.Compiler$CompilerException: Syntax error macroexpanding clojure.core/fn at (clojure/core/unify.clj:83:18).
#:clojure.error{:phase :macro-syntax-check, :line 83, :column 18, :source "clojure/core/unify.clj", :symbol clojure.core/fn}
at clojure.lang.Compiler.checkSpecs (Compiler.java:6971)