[ClojureScript] re-frame - register-sub has no effect when body uses a let-binding

[Colin Yates]

I know I am going insane:

(register-sub
  :add-patient/selected-journey-details-field
  (fn [db]
    (reaction (-> [:add-patient/local]
                  subscribe
                  deref :selected-journey-details-field))

    #_(let [v (-> [:add-patient/local]
                subscribe
                deref :selected-journey-details-field)]
      (reaction v))))

works but

(register-sub
  :add-patient/selected-journey-details-field
  (fn [db]
    #_(reaction (-> [:add-patient/local]
                  subscribe
                  deref :selected-journey-details-field))

    (let [v (-> [:add-patient/local]
                subscribe
                deref :selected-journey-details-field)]
      (reaction v))))

doesn't. And by 'not working' I mean the component doesn't notice any changes 
to a subscription to :add-patient/selected-journey-details-field.

After 4 hours banging my head I reduced it to the above, literally commenting 
one and uncommenting the other (with a browser refresh in-between).

Any suggestions? 

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