Greetings,
The nuance below took a long time to identify and reduce from a test
failure. Should it be considered a bug?
$ lein repl
nREPL server started on port 52758 on host 127.0.0.1
REPL-y 0.3.0
Clojure 1.6.0
<snipped>
user=> (defrecord Fields0 []) ; record with 0 fields
user.Fields0
user=> (defrecord Fields1 [f]) ; record with 1 field
user.Fields1
user=> (def f0 (->Fields0)) ; instance with empty map
#'user/f0
user=> (def f0x (map->Fields0 {:x 0})) ; instance with not-empty map, due
to extra field
#'user/f0x
user=> (def f1 (map->Fields1 {})) ; instance with not-empty map,
declared field is nil
#'user/f1
user=> f0
#user.Fields0{}
user=> f0x
#user.Fields0{:x 0}
user=> f1
#user.Fields1{:f nil}
user=> (eval f0) ; *** morphs to empty map on eval ***
{}
user=> (eval f0x) ; self-evaluates when non-empty map,
field added
#user.Fields0{:x 0}
user=> (eval f1) ; self-evaluates when non-empty map,
declared field
#user.Fields1{:f nil}
user=>
Greg
p.s. A little help with "not quite getting
refs"<https://groups.google.com/forum/#!topic/clojure/o9FiG1kCt6I>,
please? Or is this the wrong forum for such a question?
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