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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