Add record? predicate

Description

Would like a predicate that can be used to check whether an object is an instance of a defrecord.

Patch: clj-394-add-predicate-for-record-3.diff

Approach: Use existing marker interface IRecord to add new record? predicate.

user=> (defrecord Foo [x])
user.Foo
user=> (def f (->Foo 1))
#'user/f
user=> (record? f)
true

Screened by: Alex Miller

None

Unassigned

import

Code and Test

Minor