gensym / anonymous function syntax breaks fast refresh about helix

[roman01la]

FYI I had a similar issue in UIx, here's the fix, perhaps it can help pitch-io/uix@7c39a4e

[lilactown]

Thanks for the report.

I haven't tested this, but since it's the defnc macro that does the fast-refresh detection, I think this is only a problem for things that gensym new bindings in the reader. E.g. if you have a macro that gensyms some binding,

(defnc my-component
  []
  (hooks/use-effect [] (my-thing-that-generates-some-bindings-internally))
  ,,,)

The code used by defnc will be the non-macro-expanded forms. It's only because the anonymous function syntax expansion happens in the reader that this is a problem. I think.

Based on my reading here https://github.com/clojure/tools.reader/blob/fb185af411fa379e48e5d0a9e623b68f552d8c92/src/main/clojure/clojure/tools/reader.clj#L528-L532 I think that detecting the # at the end of the binding seems easiest.

PR welcome!