Latest clerk errors on notebook analyses, ->hash must be ifn?

[sritchie]

On https://github.com/mentat-collective/mathbox.cljs, branch sritchie/new_release, when I build my static bundle with bb publish-local I see the following output:

🔬 Analyzing… ->hash must be `ifn?` {:->hash nil, :codeblock {:form (show-sci [mathbox/Mathbox {:style {:height 500px, :width 100%}, :init {:background-color 16777215, :camera-position [3 2 5], :scale 500}} [mb/Cartesian {} [mb/Transform4 {:matrix (let [a (/ (* (:projectionAngle (clojure.core/deref !state)) 2 Math/PI) 360.0)] [1 0 0 (Math/cos a) 0 1 0 0 0 0 1 (Math/sin a) 0 0 0 1])} [mb/Area {:rangeX [-3 1], :rangeY [(* -2 Math/PI) (* 2 Math/PI)], :width 129, :height 65, :channels 4, :expr (fn [emit x y _i _j] (let [r (Math/exp x)] (emit (* r (Math/cos y)) (* r (Math/sin y)) x y)))}] [mb/Surface {:color (:surface (clojure.core/deref !state)), :zBias -0.25}] [mb/Line {:color (:line (clojure.core/deref !state)), :width 4}] [mb/Transpose {:order yxzw}] [mb/Line {:color (:line (clojure.core/deref !state)), :width 4}]]]]), :ns-effect? false, :freezable? true, :no-cache? false, :deps #{nextjournal.clerk/with-viewer mentat.clerk-utils.show/show-sci nextjournal.clerk/mark-presented}, :file /Users/sritchie/.gitlibs/libs/io.github.mentat-collective/clerk-utils/e40cdf79edf45748f5a2c6752c8156b3d240b087/src/mentat/clerk_utils/show.cljc, :id mathbox.examples.math.exponential/anon-expr-5drxcaGZr7zvK46gPq5a5FKTUYBvdG}}
Done in 600.672ms. ✅

This also comes up at the REPL when I save the file containing this form, but only sometimes.

I'm not sure how :->hash nil ends up in there. This is happening on version 5cf3982, and was NOT happening a week ago with the same code, though I haven't done a proper bisection to figure out when this came in.

[mk]

This is a warning, not an error. I believe it happens when there's a cycle in Clerk's dependency graph wich leads to on dependency not having a hash set.

Also can be seen in https://github.com/nextjournal/clerk/blob/6609765bcd64fca51f8fdae0800aa93419bfc058/notebooks/how_clerk_works.clj

->hash must be `ifn?` {:->hash nil, :codeblock {:form (ana/find-location (quote io.methvin.watcher.DirectoryChangeEvent)), :ns-effect? false, :freezable? true, :no-cache? false, :deps #{nextjournal.clerk.analyzer/find-location}, :file src/nextjournal/clerk/analyzer.clj, :id how-clerk-works/anon-expr-5drprLrHeSR2p9YPFsKRNUPd9Ponef}}