I get the cider-nrepl warning, but I can't find its cause.

[joostkremers]

Hi,

Suddenly yesterday I started getting the cider-nrepl warning whenever I'm starting a new repl:

WARNING: CIDER 0.18.0-snapshot requires cider-nrepl 0.18.0+, but you're currently using cider-nrepl 0.18.0. Things will break!

I followed the link provided, but there turned out not to be a file profiles.clj in ~/.lein/, and project.clj doesn't mention cider-nrepl at all. (I use leiningen, not boot, so there's no build.boot or ~/.boot/profile.boot to check) So that leaves me wondering where the problem lies.

I'm a Clojure newbie, and I just followed the getting started guides for installing Clojure and Cider and didn't configure anything special. (What I'm saying is that I don't really have an idea of how everything works, what components exist where and what they do. Heck, I can't even find the code for cider/cider-nrepl on my system...)

I create new projects with lein new app <name> and I get the warning even with a freshly created project. Things were fine for the past couple of weeks, this just started happening yesterday, as mentioned.

Version info:

Elisp> (emacs-version)
"GNU Emacs 26.1.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.18.9)\n of 2018-08-13"

-;; CIDER 0.18.0snapshot (package: 20180817.153), nREPL 0.2.13
;; Clojure 1.8.0, Java 10.0.2

The *Messages* buffer says this after starting a repl:

[nREPL] Starting server via /home/joost/bin/lein update-in :dependencies conj [org.clojure/tools.nrepl\ "0.2.13"\ :exclusions\ [org.clojure/clojure]] -- update-in :plugins conj [cider/cider-nrepl\ "0.18.0"] -- repl :headless :host ::...

Which suggests to me that Cider is indeed trying to use cider-nrepl version 0.18.0, but I can't figure out whether I configured it to do so.

[bbatsov]

You've installed a bad build. This was fixed yesterday, so updating should solve your issue.

[bbatsov]

f085330

[joostkremers]

Actually, I think I already had the latest version installed, because list-packages didn't list an update for Cider. (The version info above seems to confirm this: it says package 20180817.153). Just in case, I deleted the package, restarted Emacs and reinstalled, but the error remains.

However, any chance that

(version<= middleware-version cider-required-middleware-version)

should actually be

(version< middleware-version cider-required-middleware-version)

?

I ran cider--check-middleware-compatibility through Edebug and both middleware-version and cider-required-middleware-version are "0.18.0" in my case, so regardless of the order of arguments, version<= is going to be true...

[bbatsov]

Ops, you're completely right!

[joostkremers]

Thanks!