Confusing project.clj syntax error

[paddymul]

I am new to figwheel and clojurescript. I started from https://github.com/reagent-project/reagent-template . I have been trying to configure cider with emacs. While following those instructions I added the line :repl-options {:nrepl-middleware [cider.piggieback/wrap-cljs-repl]} to my project.clj. .

This caused the following syntax error when running lein fighweel

(base)  ~/code/reag-play  [master] $ ~/bin/lein 
OpenJDK 64-Bit Server VM warning: Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.
java.lang.Exception: Error loading /Users/paddy/code/reag-play/project.clj

snip

Caused by: clojure.lang.Compiler$CompilerException: Syntax error reading source at (/Users/paddy/code/reag-play/project.clj:115:37).
#:clojure.error{:phase :read-source, :line 115, :column 37, :source "/Users/paddy/code/reag-play/project.clj"}
 at clojure.lang.Compiler.load (Compiler.java:7642)

Eventually I figured out that this error was caused by an existing :repl-options declaration in the same block. Once I figured out that I was redeclaring :repl-options it was easy to fix the problem. The syntax error stack trace was not helpful at all.

I would have expected an error describing the duplicate key.

I'm not sure about the suggested fix. Maybe an explicit instruction to look out for this case on fighweel NRepl instructions

I could also see the case that this is a bug with Leiningen.

Keep up the good work on Figwheel.