Thanks Nicola and Justin,
syntax quote works, if the call of the macro is explicitely given in the
code.
In the real situation, whereI had the problem, the form which contains the
macro call is generated on the fly by a function.
But your hint helps nethertheless:
I bind the namespace to that in which the macro is defined:
(ns m
(:gen-class))
(defmacro mx
[x]
(list 'y))
(defn -main []
(binding[*ns* (find-ns 'm)]
(println (macroexpand-1 `(mx P))))
(println (macroexpand-1 '(and P Q))))
Am Donnerstag, 15. Februar 2018 12:52:39 UTC+1 schrieb Justin Smith:
>
> To elaborate on Nicola's correct answer, when -main is run from outside
> its namespace, the binding of mx comes from the current environment (which
> doesn't see a macro, and likely has no binding for mx). If you use ` in
> -main, the currently visible binding is properly namespace qualified so
> that it expands when called from outside the namespace.
>
> On Thu, Feb 15, 2018, 03:12 Nicola Mometto <brob...@gmail.com
> <javascript:>> wrote:
>
>> Use ` instead of '
>>
>>
>> On 15 Feb 2018, at 08:45, 'Burt' via Clojure <clo...@googlegroups.com
>> <javascript:>> wrote:
>>
>> Here is something strange, and I don't see why!
>> Can anybody help?
>>
>> This is the code in m.clj
>>
>> (ns m
>> (:gen-class))
>>
>> (defmacro mx
>> [x]
>> (list 'y))
>>
>> (defn -main []
>> (println (macroexpand-1 '(mx P)))
>> (println (macroexpand-1 '(and P Q))))
>>
>>
>> 1 When i load the namespace into a REPL and invoke (-main)
>>
>> the result is (as expected):
>>
>>
>> (y)
>> (clojure.core/let [and__5236__auto__ P] (if and__5236__auto__
>> (clojure.core/and Q) and__5236__auto__))
>> => nil
>>
>>
>> 2 When I make an uberjar with leiningen (in IntelliJ with cursive) and run
>> the jar
>>
>> the result is (not as expected):
>>
>>
>> (mx P)
>> (clojure.core/let [and__5236__auto__ P] (if and__5236__auto__
>> (clojure.core/and Q) and__5236__auto__))
>>
>>
>> In the second case the macro mx is not expanded and I have no idea why this
>> is the case.
>>
>>
>> Kind regards,
>>
>> Burt
>>
>>
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