Clojure

• Type: Defect
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: Release 1.4
• Fix Version/s: Release 1.6
• Component/s: None
• Labels:

  None

Using clojure.walk functions fails surprisingly for data containing records defined with defrecord:

user=> (defrecord Foo [x])
user.Foo
user=> (def f (Foo. :x))
#'user/f
user=> (use 'clojure.walk)
nil
user=> (postwalk identity {:foo f})
UnsupportedOperationException Can't create empty: user.Foo user.Foo (NO_SOURCE_FILE:1)

This seems to be because clojure.walk/walk guards a call to (empty form) with a (coll? form) check. The check succeeds because records implement IPersistentCollection, but (empty form) throws an exception. This looks to me like a bug in clojure.walk (it should check records separately and either treat them as atomic or implement a way of walking through them) but perhaps it is a sign of some unclarity in the contract of collections.

• Assignee:

  Unassigned

  Reporter:

  Jouni K. Seppänen

• Created:

  08/Nov/12 8:20 AM

  Updated:

  12/Apr/13 9:42 AM