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[CLJ-1273] def discards ^:macro when used outside the top-level Created: 02/Oct/13  Updated: 17/Jan/14  Resolved: 17/Jan/14

Status: Closed
Project: Clojure
Component/s: None
Affects Version/s: Release 1.5
Fix Version/s: None

Type: Defect Priority: Major
Reporter: André Gustavo Rigon Assignee: Unassigned
Resolution: Duplicate Votes: 0
Labels: :macro, conditional, def, macro, metadata, top-level


 Description   

If I evaluate

(def ^:macro my-defn1 #'defn)

a macro named 'my-defn1' is defined, which I can use just like 'defn'.

However, if I evaluate instead

(if true
  (def ^:macro my-defn2 #'defn))

the var for 'my-defn2' doesn't have the :macro metadata set and I can't use it as a macro, even though the 'def' form is equal to the previous case.

Here is a complete example:

(def ^:macro my-defn1 #'defn)

(if true
  (def ^:macro my-defn2 #'defn))

(println (meta #'my-defn1))    ; => contains :macro

(println (meta #'my-defn2))    ; => doesn't contain :macro!

(my-defn1 hello1 []
          (println "hello 1"))

(hello1)                       ; => prints "hello 1"

(my-defn2 hello2 []            ; => CompilerException: Unable to resolve 
  (println "hello 2"))         ;    symbol: hello2 in this context


 Comments   
Comment by Gary Fredericks [ 09/Dec/13 1:31 PM ]

I hopped around the code for a while and all I could find is that the bindRoot method in Var.java intentionally clears :macro from the metadata.

Comment by Nicola Mometto [ 17/Jan/14 7:03 PM ]

Duplicate of http://dev.clojure.org/jira/browse/CLJ-1021





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