Variable-length arguments in protocols seem to be supported, but
there's just a weird, stateful behavior. Look what happens when you
call foo first with one argument twice (it fails both times), then two
arguments (it succeeds), then one argument again (it succeeds now
too!). Is this a Clojure bug?
Clojure 1.1.0-alpha-SNAPSHOT
user=> (defprotocol P (foo [x & args]))
P
user=> (deftype T [x])
#'user/T
user=> (extend ::T P {:foo (fn [x & args] args)})
nil
user=> (foo (T 42))
java.lang.IllegalArgumentException: Wrong number of args passed to:
user$eval--12$fn--14$G--1 (NO_SOURCE_FILE:0)
user=> (foo (T 42))
java.lang.IllegalArgumentException: Wrong number of args passed to:
user$eval--12$fn--14$G--1 (NO_SOURCE_FILE:0)
user=> (foo (T 42) 1 2)
(1 2)
user=> (foo (T 42))
nil
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