Given something like this:
(defrecord F [a])
This fails:
(clojure.walk/postwalk identity [(F. 1)])
because although (coll? (F. 1)) is true, (empty (F. 1)) fails ("can't
create empty").
I've had to write an alternative to walk anyway (it discards
metadata), and I'd like it to be able to accommodate this case more
elegantly than calling empty and catching the exception if the object
happens to be a record. (I suppose the best way would be to define
walk in terms of something like fmap, so that individual records could
decide whether they can be recursed into or not, but that might be
overkill.)
So:
Q1: is this a bug in walk?
Q2: is there a way to tell if something is an instance of a class
created with defrecord?
--
Ben Wolfson
"Human kind has used its intelligence to vary the flavour of drinks,
which may be sweet, aromatic, fermented or spirit-based. ... Family
and social life also offer numerous other occasions to consume drinks
for pleasure." [Larousse, "Drink" entry]
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