> How can I make a symbol without a namespace in syntax quoting?
You need quote + unquote.
user=> (defmacro moo2 [] `(defn ~'foo []))
#'user/moo2
user=> (macroexpand-1 '(moo2))
(clojure.core/defn foo [])
user=> (moo2)
#'user/foo
Focus on *~'foo *thing, we first *quote* the foo and *unquote* is using ~.
On Mon, Mar 2, 2020 at 4:09 PM Anatoly Smolyaninov <zarkonesm...@gmail.com>
wrote:
> Yes, backtick is hygienic, i.e. it adds ns to symbols. you can define name
> first and inject:
>
> ```
> (defmacro moo2 []
> (let [name (symbol "foo")]
> `(defn ~name [])))
>
> ```
>
> понедельник, 2 марта 2020 г., 10:54:51 UTC+1 пользователь Sonny To написал:
>>
>> (defmacro moo1 []
>> '(defn foo []))
>>
>> (defmacro moo2 []
>>
>>
>> `(defn foo []))
>>
>> stigmergy.wocket.server> (moo1)
>>
>> #'stigmergy.wocket.server/foo
>>
>>
>> stigmergy.wocket.server> (moo2)
>>
>> CompilerException clojure.lang.ExceptionInfo: Call to clojure.core/defn
>> did not conform to spec:
>> In: [0] val: stigmergy.wocket.server/foo fails spec:
>> :clojure.core.specs.alpha/defn-args at: [:args :name] predicat\
>> e: simple-symbol?
>>
>> #:clojure.spec.alpha{:problems [{:path [:args :name], :pred
>> clojure.core/simple-symbol?, :val stigmergy.wocket.ser\
>> ver/foo, :via [:clojure.core.specs.alpha/defn-args
>> :clojure.core.specs.alpha/defn-args], :in [0]}], :spec #object[c\
>> lojure.spec.alpha$regex_spec_impl$reify__2436 0x33d84248
>> "clojure.spec.alpha$regex_spec_impl$reify__2436@33d84248"]\
>> , :value (stigmergy.wocket.server/foo []), :args
>> (stigmergy.wocket.server/foo [])}, compiling:(*cider-repl workspac\
>> e/clj-collage:localhost:39319(clj)*:131:26)
>>
>> stigmergy.wocket.server> (macroexpand-1 '(moo1))
>> (defn foo [])
>>
>> stigmergy.wocket.server> (macroexpand-1 '(moo2))
>> (clojure.core/defn stigmergy.wocket.server/foo [])
>>
>>
>>
>>
>> moo1 uses normal quoting while moo2 uses syntax quoting. Why does (moo1)
>> succeeds but( moo2) fails? Both seem to evaluate to same data-structure
>> except moo2 has namespaces.
>>
>> The error message is cryptic but it seems moo2 is failing on
>> clojure.core/simple-symbol?
>> which seems like a symbol without a namespace. How can I make a symbol
>> without a namespace in syntax quoting?
>>
>>
>>
>>
>> --
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