extend already refers to: #'clj-time.core/extend in namespace
I started using the clj-time library and found that it works great. Only issue I don't understand is this one about extend already refers to another version of extend. It seems that clj-time has a function called extend that conflicts with the same named function in clojure.core. The recommendation online is to put (:refer-clojure :exclude [extend]) in your ns declaration. I've done this. My core.clj file looks like the following: (ns test.core test project (:refer-clojure :exclude (extend)) (:use clj-time.core)) (defn foo [] (print asdf)) It sounded like doing this would inside my project use the extend inside of clj-time.core rather than the clojure one. The following two scenarios happen and don't make sense to me. The first is I slime-connect to a new swank session. The repl is in user. I open my test/core.clj file and compile it. When I return to the repl and (ns test.core) I get a sldb trace which I need to quit. It has the following complaint: extend already refers to: #'clj-time.core/extend in namespace: test.core The second is a variation where I start a new swank session and in the repl change the name space to test.core (ns test.core). Then I open test/core.clj and compile it. This time I just a warning printed to the REPL as follows: WARNING: extend already refers to: #'clojure.core/extend in namespace: test.core, being replaced by: #'clj-time.core/extend Can anyone explain what is going on here. I don't quite get it. - Brad -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: extend already refers to: #'clj-time.core/extend in namespace
Btw, I'm using clojure-1.2.0.jar clj-time-0.3.0.jar - Brad On Sep 8, 5:03 pm, Brad b...@beaconhill.com wrote: I started using the clj-time library and found that it works great. Only issue I don't understand is this one about extend already refers to another version of extend. It seems that clj-time has a function called extend that conflicts with the same named function in clojure.core. The recommendation online is to put (:refer-clojure :exclude [extend]) in your ns declaration. I've done this. My core.clj file looks like the following: (ns test.core test project (:refer-clojure :exclude (extend)) (:use clj-time.core)) (defn foo [] (print asdf)) It sounded like doing this would inside my project use the extend inside of clj-time.core rather than the clojure one. The following two scenarios happen and don't make sense to me. The first is I slime-connect to a new swank session. The repl is in user. I open my test/core.clj file and compile it. When I return to the repl and (ns test.core) I get a sldb trace which I need to quit. It has the following complaint: extend already refers to: #'clj-time.core/extend in namespace: test.core The second is a variation where I start a new swank session and in the repl change the name space to test.core (ns test.core). Then I open test/core.clj and compile it. This time I just a warning printed to the REPL as follows: WARNING: extend already refers to: #'clojure.core/extend in namespace: test.core, being replaced by: #'clj-time.core/extend Can anyone explain what is going on here. I don't quite get it. - Brad -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: extend already refers to: #'clj-time.core/extend in namespace
Hi, the correct way to *change* to a namespace is in-ns. Calling ns will also refer to clojure.core. The first scenario happens because the namespace already exists and the ns tries to refer extend to #'clojure.core/extend which fails because #'clj-time.core/extend is already there. The second scenario happens because the namespace did not exist before. So the ns form sets up everything as normal. Now loading the file will refer extend to clj-time.core/extend. This will only give a warning because now clojure.core/extend is replaced and clojure.core gets special treatment here by giving only a warning instead of an exception. tl;dr: Use ns to setup a namespace. Use in-ns to switch namespaces. In your case: (in-ns 'test.core). Sincerely Meikel -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
